diff --git a/.github/copilot-instructions.md b/.github/copilot-instructions.md
index 32faaca..4200315 100644
--- a/.github/copilot-instructions.md
+++ b/.github/copilot-instructions.md
@@ -2888,72 +2888,82 @@ ORDER BY MIN(adx) DESC;
 
 ## Common Pitfalls
 
-**⚠️ CRITICAL REFERENCE: See `docs/COMMON_PITFALLS.md` for complete list (72 documented issues)**
+**⚠️ CRITICAL REFERENCE: See `docs/COMMON_PITFALLS.md` for complete list (73 documented issues)**
 
 This section contains the **TOP 10 MOST CRITICAL** pitfalls that every AI agent must know. For full details, category breakdowns, code examples, and historical context, see the complete documentation.
 
 ### 🔴 TOP 10 CRITICAL PITFALLS
 
-**1. Drift SDK Memory Leak (#1)** - JavaScript heap OOM after 10+ hours
+**1. Position Manager Monitoring Stops Randomly (#73 - CRITICAL - Dec 7, 2025)**
+- **Symptom:** PM last update at 23:21 Dec 6, stopped for 90+ minutes, user forced to manually close
+- **Root Cause:** Drift state propagation delay (5+ min) → 60s timeout expires → false "external closure" detection → `activeTrades.delete()` → monitoring stops
+- **Financial Impact:** Real losses during unmonitored period
+- **THE FIX (3 Safety Layers - DEPLOYED Dec 7, 2025):**
+  * **Layer 1:** Extended timeout from 60s → 5 minutes (allows Drift state to propagate)
+  * **Layer 2:** Double-check with 10s delay before processing external closure (catches false positives)
+  * **Layer 3:** Verify Drift has no positions before calling stopMonitoring() (fail-safe)
+- **Code Locations:**
+  * Layer 1: `lib/trading/position-manager.ts` line ~792 (timeout extension)
+  * Layer 2: `lib/trading/position-manager.ts` line ~603 (double-check logic)
+  * Layer 3: `lib/trading/position-manager.ts` line ~1069 (Drift verification)
+- **Expected Impact:** Zero unprotected positions, false positive detection eliminated
+- **Status:** ✅ DEPLOYED Dec 7, 2025 02:47 UTC (commit ed9e4d5)
+- **See:** `docs/PM_MONITORING_STOP_ROOT_CAUSE_DEC7_2025.md` for complete analysis
+
+**2. Drift SDK Memory Leak (#1)** - JavaScript heap OOM after 10+ hours
 - **Solution:** Smart error-based health monitoring (`lib/monitoring/drift-health-monitor.ts`)
 - **Detection:** `interceptWebSocketErrors()` patches console.error
 - **Action:** Restarts if 50+ errors in 30-second window
 - **Status:** Fixed Nov 15, 2025, Enhanced Nov 24, 2025
 
-**2. Wrong RPC Provider (#2)** - Alchemy breaks Drift SDK subscriptions
+**3. Wrong RPC Provider (#2)** - Alchemy breaks Drift SDK subscriptions
 - **FINAL CONCLUSION:** Use Helius RPC, NEVER use Alchemy
 - **Root Cause:** Alchemy rate limits break Drift's burst subscription pattern
 - **Evidence:** 17-71 subscription errors with Alchemy vs 0 with Helius
 - **Status:** Investigation Complete Nov 14, 2025
 
-**3. P&L Compounding Race Condition (#48, #49, #59, #60, #61, #67)**
+**4. P&L Compounding Race Condition (#48, #49, #59, #60, #61, #67)**
 - **Pattern:** Multiple monitoring loops detect same closure → each adds P&L
 - **Result:** $6 real → $92 recorded (15x inflation)
 - **Fix:** Use `Map.delete()` atomic return as deduplication lock (Dec 2, 2025)
 - **Code:** `if (!this.activeTrades.delete(tradeId)) return` - first caller wins
 
-**4. Database-First Pattern (#29)** - Save DB before Position Manager
+**5. Database-First Pattern (#29)** - Save DB before Position Manager
 - **Rule:** `createTrade()` MUST succeed before `positionManager.addTrade()`
 - **Why:** If DB fails, API returns 500 with "CLOSE POSITION MANUALLY"
 - **Impact:** Without this, positions become untracked on container restart
 - **Status:** Fixed Nov 13, 2025
 
-**5. Container Deployment Verification (#31)**
+**6. Container Deployment Verification (#31)**
 - **Rule:** NEVER say "fixed" without checking container timestamp
 - **Verification:** `docker logs trading-bot-v4 | grep "Server starting"` vs `git log -1 --format='%ai'`
 - **If container older than commit:** CODE NOT DEPLOYED, FIX NOT ACTIVE
 - **Status:** Critical lesson from Nov 13, 2025 incident
 
-**6. Position.size Tokens vs USD (#24)** - SDK returns tokens, not USD
+**7. Position.size Tokens vs USD (#24)** - SDK returns tokens, not USD
 - **Bug:** Comparing 12.28 tokens to $1,950 → "99.4% reduction" → false TP1
 - **Fix:** `positionSizeUSD = Math.abs(position.size) * currentPrice`
 - **Impact:** Without fix, TP1 never triggers correctly
 - **Status:** Fixed Nov 12, 2025
 
-**7. Ghost Detection Atomic Lock (#67)** - Map.delete() as deduplication
+**8. Ghost Detection Atomic Lock (#67)** - Map.delete() as deduplication
 - **Pattern:** Async handlers called by multiple code paths simultaneously
 - **Solution:** `if (!this.activeTrades.delete(tradeId)) { return }` - atomic lock
 - **Why:** JavaScript Map.delete() returns true only for first caller
 - **Status:** Fixed Dec 2, 2025
 
-**8. Smart Entry Wrong Price (#66, #68)** - Use Pyth price, not webhook
+**9. Smart Entry Wrong Price (#66, #68)** - Use Pyth price, not webhook
 - **Bug #66:** Symbol format mismatch ("SOLUSDT" vs "SOL-PERP") caused cache miss
 - **Bug #68:** Webhook `signal.price` contained percentage (70.80) not market price ($142)
 - **Fix:** Always use `pythClient.getPrice(symbol)` for calculations
 - **Status:** Fixed Dec 1-3, 2025
 
-**9. MFE/MAE Wrong Units (#54)** - Store percentages, not dollars
+**10. MFE/MAE Wrong Units (#54)** - Store percentages, not dollars
 - **Bug:** Storing $64.08 when should store 0.48% (133× inflation)
 - **Fix:** `trade.maxFavorableExcursion = profitPercent` not `currentPnLDollars`
 - **Impact:** Analytics completely wrong for all trades
 - **Status:** Fixed Nov 23, 2025
 
-**10. Execute Endpoint Quality Bypass (#62)** - Quality check after timeframe validation
-- **Bug:** Quality calculated but never validated → trades at quality 30 executed
-- **Fix:** Add explicit quality check AFTER timeframe confirmation
-- **Code:** `if (qualityResult.score < minQualityScore) return 400`
-- **Status:** Fixed Nov 27, 2025
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