diff --git a/src/mesh/SX126xInterface.cpp b/src/mesh/SX126xInterface.cpp
index bcb08f2c59a..44c4a805ac3 100644
--- a/src/mesh/SX126xInterface.cpp
+++ b/src/mesh/SX126xInterface.cpp
@@ -455,6 +455,15 @@ template <typename T> void SX126xInterface<T>::resetAGC()
     // RX boosted gain mode
     lora.setRxBoostedGainMode(config.lora.sx126x_rx_boosted_gain);
 
+    // Re-apply the undocumented 0x8B5 RX sensitivity patch that was set in init().
+    // The CALIBRATE_ALL (0x7F) command above clears bit 0 of register 0x8B5, which
+    // silently removes the RX sensitivity improvement introduced in #9571 / #9777.
+    // Without this re-apply, every SX1262 node loses its RX boost ~60s after boot
+    // and never recovers until reboot. See empirical evidence in the PR description.
+    if (module.SPIsetRegValue(0x8B5, 0x01, 0, 0) != RADIOLIB_ERR_NONE) {
+        LOG_WARN("SX126x resetAGC: failed to re-apply 0x8B5 RX sensitivity patch");
+    }
+
     // 6. Resume receiving
     startReceive();
 }