you need to provide the logs when looking for help. My solution is used to solve Socket->SendTo failed with error 2 (SE_EBADF) bad file description problem. It causes problem when the GC try to recycle net connection but the socket is currently in use. because unreal doesn’t recycle the socket on time and it’s being reused.
I don’t know much about your issue. it could be as same as mine. Or maybe it’s totally different problem and just act same (disconnect or crash).