Would you happen to be having Internet issues? All of them crashing at once sound like some type of connectivity problems. You can review your mining logs and/or router logs if you keep them.

Other suspects causes could be you are having slight electrical power fluctuations, not enough to shut off your miners completely but enough to crash the program. Could also be heat related, but this is less likely in the winter unless you live in the southern hemisphere..

You could even have a virus or some other malware on your network.

I should also add the in Winter with dryer air, which is likely if you are running many mining rigs, static electricity can become an issue. Just someone or something (pets) walking by a rig can be enough to cause it to crash.