diff --git a/models/GpsTracksModels.js b/models/GpsTracksModels.js
index 7d299ff..5a74afa 100755
--- a/models/GpsTracksModels.js
+++ b/models/GpsTracksModels.js
@@ -440,7 +440,7 @@ class GpsTracksModels {
 						if (trackLock) {
 							await rltmMutex.unlock(trackLock)
 						}
-						conn.release();
+						// conn.release();
 					}
 				}
 
@@ -529,7 +529,7 @@ class GpsTracksModels {
 						console.log("ERROR unlock mutex : " + rltm.device_id, unlockErr)
 					}
 				}
-				conn.release(); // release connection
+				// conn.release(); // release connection
 			}
 		})
 	}