diff --git a/server/src/rewards/definitions/cameraWhiplash.js b/server/src/rewards/definitions/cameraWhiplash.js
index a076acd2..23f316ed 100644
--- a/server/src/rewards/definitions/cameraWhiplash.js
+++ b/server/src/rewards/definitions/cameraWhiplash.js
@@ -1,5 +1,6 @@
 const STEP_MS = 220;
-const STEPS = 40;
+const DURATION_MS = 30 * 1000;
+const STEPS = Math.ceil(DURATION_MS / STEP_MS);
 
 module.exports = {
   id: 'cameraWhiplash',
@@ -29,13 +30,23 @@ module.exports = {
       });
       if (step >= STEPS) {
         clearInterval(timer);
+        rovers.forEach((rover) => {
+          try {
+            ctx.issueCommand(String(rover.id), {
+              type: 'servo',
+              servo: { angle: 0 },
+            });
+          } catch (err) {
+            ctx.logger.warn('cameraWhiplash servo reset failed', { roverId: rover.id, error: err.message });
+          }
+        });
       }
     }, STEP_MS);
 
     ctx.sendAlert({
       color: '#00bcd4',
       title: 'Camera Wiggle',
-      message: `Wobble running on ${rovers.length} rover(s).`,
+      message: `Wobble running for 30 seconds on ${rovers.length} rover(s).`,
     });
   },
 };
diff --git a/server/src/rewards/definitions/chatSpam.js b/server/src/rewards/definitions/chatSpam.js
index c87a153f..0a96e92c 100644
--- a/server/src/rewards/definitions/chatSpam.js
+++ b/server/src/rewards/definitions/chatSpam.js
@@ -1,32 +1,48 @@
 const LETTERS = 'abcdefghijklmnopqrstuvwxyz';
+const BURST_COUNT = 18;
+const MIN_BURST_SIZE = 2;
+const MAX_BURST_SIZE = 8;
+const MIN_BURST_DELAY_MS = 80;
+const MAX_BURST_DELAY_MS = 420;
 
 function randLetter() {
   return LETTERS[Math.floor(Math.random() * LETTERS.length)];
 }
 
+function randInt(min, max) {
+  return min + Math.floor(Math.random() * (max - min + 1));
+}
+
+function sleep(ms) {
+  return new Promise((resolve) => setTimeout(resolve, ms));
+}
+
 module.exports = {
   id: 'chatSpam',
   name: 'Chat Spam',
   goal: 320,
   async run(ctx) {
     const nickname = randLetter();
-    const messageCount = 100;
-    for (let i = 0; i < messageCount; i += 1) {
-      const len = 3 + Math.floor(Math.random() * 14);
-      let text = '';
-      for (let j = 0; j < len; j += 1) {
-        text += randLetter();
-      }
-      try {
-        ctx.sendExternalMessage({
-          nickname,
-          role: 'spectator',
-          roverId: null,
-          text,
-        });
-      } catch {
-        // ignore spam errors
+    for (let burst = 0; burst < BURST_COUNT; burst += 1) {
+      const burstSize = randInt(MIN_BURST_SIZE, MAX_BURST_SIZE);
+      for (let i = 0; i < burstSize; i += 1) {
+        const len = 3 + Math.floor(Math.random() * 14);
+        let text = '';
+        for (let j = 0; j < len; j += 1) {
+          text += randLetter();
+        }
+        try {
+          ctx.sendExternalMessage({
+            nickname,
+            role: 'spectator',
+            roverId: null,
+            text,
+          });
+        } catch {
+          // ignore spam errors
+        }
       }
+      await sleep(randInt(MIN_BURST_DELAY_MS, MAX_BURST_DELAY_MS));
     }
   },
 };
diff --git a/server/src/rewards/definitions/ghostTypingSpam.js b/server/src/rewards/definitions/ghostTypingSpam.js
index 56ffc037..976f9ed2 100644
--- a/server/src/rewards/definitions/ghostTypingSpam.js
+++ b/server/src/rewards/definitions/ghostTypingSpam.js
@@ -1,16 +1,23 @@
 const NAMES = ['ross', 'david', 'chirpet', 'caydu', 'meow', 'wawa'];
-const BURSTS = 200;
-const TICK_MS = 180;
+const BURSTS = 120;
+const MIN_BURST_DELAY_MS = 70;
+const MAX_BURST_DELAY_MS = 350;
+
+function randInt(min, max) {
+  return min + Math.floor(Math.random() * (max - min + 1));
+}
+
+function sleep(ms) {
+  return new Promise((resolve) => setTimeout(resolve, ms));
+}
 
 module.exports = {
   id: 'ghostTypingSpam',
   name: 'Typing Spam',
   goal: 220,
   async run(ctx) {
-    let tick = 0;
     const active = new Set();
-    const timer = setInterval(() => {
-      tick += 1;
+    for (let burst = 0; burst < BURSTS; burst += 1) {
       const name = NAMES[Math.floor(Math.random() * NAMES.length)] + String(Math.floor(Math.random() * 10));
       const on = Math.random() > 0.35;
       try {
@@ -24,17 +31,16 @@ module.exports = {
       } catch {
         // ignore
       }
-      if (tick >= BURSTS) {
-        clearInterval(timer);
-        active.forEach((ghost) => {
-          try {
-            ctx.sendExternalTyping({ nickname: ghost, role: 'spectator', roverId: null, isTyping: false });
-          } catch {
-            // ignore
-          }
-        });
+      await sleep(randInt(MIN_BURST_DELAY_MS, MAX_BURST_DELAY_MS));
+    }
+
+    active.forEach((ghost) => {
+      try {
+        ctx.sendExternalTyping({ nickname: ghost, role: 'spectator', roverId: null, isTyping: false });
+      } catch {
+        // ignore
       }
-    }, TICK_MS);
+    });
 
     ctx.sendAlert({ color: '#9c27b0', title: 'Typing Spam', message: 'Ghost typing burst started.' });
   },
diff --git a/server/src/rewards/definitions/modeJam.js b/server/src/rewards/definitions/modeJam.js
index ee714ed3..69e56ad1 100644
--- a/server/src/rewards/definitions/modeJam.js
+++ b/server/src/rewards/definitions/modeJam.js
@@ -1,4 +1,5 @@
-const DURATION_MS = 300 * 1000;
+const MIN_DURATION_MS = 5 * 60 * 1000;
+const MAX_DURATION_MS = 10 * 60 * 1000;
 
 let activeTimer = null;
 
@@ -36,7 +37,7 @@ async function restore(ctx, effect = {}) {
 
 function scheduleRestore(ctx, effect = {}) {
   clearTimer();
-  const endsAt = Number(effect.endsAt || Date.now() + DURATION_MS);
+  const endsAt = Number(effect.endsAt || Date.now() + MIN_DURATION_MS);
   const remaining = Math.max(0, endsAt - Date.now());
   const next = { ...effect, endsAt };
   ctx.saveEffect('modeJam', next);
@@ -49,12 +50,15 @@ function scheduleRestore(ctx, effect = {}) {
 
 module.exports = {
   id: 'modeJam',
-  name: 'Admin Mode',
-  goal: 1000,
+  name: 'Admin Lock',
+  goal: 900,
   async run(ctx) {
+    const durationMs =
+      MIN_DURATION_MS + Math.floor(Math.random() * (MAX_DURATION_MS - MIN_DURATION_MS + 1));
+    const endsAt = Date.now() + durationMs;
     const prevMode = ctx.getMode();
     const prevReason = ctx.getAdminReasonText();
-    const jamReason = `Locked by button box until ${new Date(Date.now() + DURATION_MS).toLocaleTimeString()}`;
+    const jamReason = `Locked by button box until ${new Date(endsAt).toLocaleTimeString()}`;
 
     try {
       ctx.setMode('admin', 'buttonbox:modeJam');
@@ -70,7 +74,7 @@ module.exports = {
     scheduleRestore(ctx, {
       prevMode,
       prevReason,
-      endsAt: Date.now() + DURATION_MS,
+      endsAt,
     });
 
     ctx.sendAlert({ color: '#ff5722', title: 'Admin Mode', message: 'Server forced into admin mode temporarily.' });
diff --git a/server/src/services/buttonBoxService.js b/server/src/services/buttonBoxService.js
index 990948cb..3d556fac 100644
--- a/server/src/services/buttonBoxService.js
+++ b/server/src/services/buttonBoxService.js
@@ -129,9 +129,10 @@ function ensureRewardAssignments() {
   });
 }
 
-function assignNewReward(button) {
+function assignNewReward(button, options = {}) {
   const allRewards = listRewards();
   if (!allRewards.length) throw new Error('No rewards configured');
+  const excludeRewardId = typeof options.excludeRewardId === 'string' ? options.excludeRewardId : null;
 
   const usedByOtherButtons = new Set(
     state.buttons
@@ -139,8 +140,15 @@ function assignNewReward(button) {
       .map((entry) => entry.rewardId)
       .filter((rewardId) => typeof rewardId === 'string' && rewardId.length > 0),
   );
-  const uniqueCandidates = allRewards.filter((reward) => !usedByOtherButtons.has(reward.id));
-  const pool = uniqueCandidates.length ? uniqueCandidates : allRewards;
+  const uniqueCandidates = allRewards.filter(
+    (reward) => !usedByOtherButtons.has(reward.id) && (!excludeRewardId || reward.id !== excludeRewardId),
+  );
+  const fallbackUniqueCandidates = allRewards.filter((reward) => !usedByOtherButtons.has(reward.id));
+  const pool = uniqueCandidates.length
+    ? uniqueCandidates
+    : fallbackUniqueCandidates.length
+      ? fallbackUniqueCandidates
+      : allRewards.filter((reward) => !excludeRewardId || reward.id !== excludeRewardId);
   const reward = pool[Math.floor(Math.random() * pool.length)] || null;
   if (!reward) throw new Error('No rewards configured');
 
@@ -260,7 +268,7 @@ async function runRewardForButton(button) {
   });
   button.lastRewardAt = Date.now();
   button.count = 0;
-  assignNewReward(button);
+  assignNewReward(button, { excludeRewardId: reward.id });
 }
 
 async function applyPress(buttonId) {