wierd thing just happent to 1 of my 1070ti rig ... miner just stopped ... no connection error, no other error, no crash, window still opened ... last line was Share accepted ...
Have you tried pressing Enter in command line after this happened?
I experienced same issue with ccminer.
After pressing Enter, there were couple of rejected shares and the miner proceeded.
Although it seems that the connection to pool wasn't broken (checked via currports/wireshark).
Maybe this could be solved by adding simple condition in the code...