The dial application-server api error: context deadline exceeded

Hello everyone,
I’m in research and build a private LoRaWAN with Chirpstack… 2 day ago, my system ran normally, device send and receive data successful, but now, I can’t transfer data, I also reinstall the system (gateway bridge, network server, application server) but it also not work. Here is the network server log. I just seen the but I can’t slove