Please post the minin.log file as attachment here so we can help you.
Or even better:
Check your minion.log file yourself,a t the bottom (last lines) or the time it does not open:
Normally the programm is not able to contact the servers then due to your
-Proxy server used
Or there might be another error which the log file can tell us.
Add exception rules (Whitelist) to your antivirus and firewall and check the system proxy.