udp_lock.diff

--- a/src/network/network_udp.cpp
+++ b/src/network/network_udp.cpp
@@ -646,7 +646,9 @@ void NetworkUDPClose()
 /** Receive the UDP packets. */
 void NetworkBackgroundUDPLoop()
 {
-       std::lock_guard<std::mutex> lock(_network_udp_mutex);
+       /* Try to take the lock, but do nothing if the mutex is already held. Avoid blocking the main network loop. */
+       if (!_network_udp_mutex.try_lock()) return;
+       std::lock_guard<std::mutex> lock(_network_udp_mutex, std::adopt_lock);

        if (_network_udp_server) {
                _udp_server_socket->ReceivePackets();