My TIG stopped working too, no longer connects to TTN.
I checked the serial debug
2019-02-11 23:06:17.375 [AIO:DEBU] ssl_tls.c:6546 MBEDTLS: mbedtls_ssl_read_record() returned -30848 (-0x7880) 2019-02-11 23:06:17.379 [AIO:ERRO] Recv failed: SSL - The peer notified us that the connection is going to be closed 2019-02-11 23:06:17.385 [AIO:DEBU]  WS connection shutdown... 2019-02-11 23:06:17.396 [TCE:VERB] Connection to MUXS closed in state 4 2019-02-11 23:06:17.404 [TCE:INFO] MUXS reconnect backoff 2s (retry 1)
I tried to Factory reset but still the same problem.
Someone have some idea about how to solve this issue?!