diff --git a/proxywatchd.py b/proxywatchd.py
index f7e2460..e814875 100644
--- a/proxywatchd.py
+++ b/proxywatchd.py
@@ -410,18 +410,29 @@ class Stats():
         with self.lock:
             elapsed = now - self.last_history_time
             if elapsed >= 5:  # Update every 5 seconds
-                # Rate
+                # Rate - with sanity checks
                 tests_delta = self.tested - self.last_history_tested
+                if tests_delta < 0:
+                    # Counter wrapped or corrupted - reset baseline
+                    self.last_history_tested = self.tested
+                    tests_delta = 0
                 rate = tests_delta / elapsed if elapsed > 0 else 0
+                # Cap at reasonable max (100/s is generous for proxy testing)
+                if rate > 100:
+                    rate = 0  # Discard bogus value
                 self.rate_history.append(round(rate, 2))
                 if len(self.rate_history) > self.HISTORY_SIZE:
                     self.rate_history.pop(0)
-                if rate > self.peak_rate:
+                if rate > self.peak_rate and rate <= 100:
                     self.peak_rate = rate
 
-                # Success rate
+                # Success rate - with sanity checks
                 passed_delta = self.passed - self.last_history_passed
+                if passed_delta < 0:
+                    self.last_history_passed = self.passed
+                    passed_delta = 0
                 sr = (passed_delta / tests_delta * 100) if tests_delta > 0 else 0
+                sr = min(sr, 100.0)  # Cap at 100%
                 self.success_rate_history.append(round(sr, 1))
                 if len(self.success_rate_history) > self.HISTORY_SIZE:
                     self.success_rate_history.pop(0)
@@ -576,7 +587,9 @@ class Stats():
             self.proto_passed['socks4'] = state.get('proto_socks4_passed', 0)
             self.proto_tested['socks5'] = state.get('proto_socks5_tested', 0)
             self.proto_passed['socks5'] = state.get('proto_socks5_passed', 0)
-            self.peak_rate = state.get('peak_rate', 0.0)
+            # Cap peak_rate at reasonable maximum (corrupted values from bugs)
+            raw_peak = state.get('peak_rate', 0.0)
+            self.peak_rate = min(raw_peak, 100.0)  # Max 100/s is generous
             # Note: start_time is NOT restored - uptime reflects current session
             # Restore failure categories
             if state.get('fail_categories'):