Good day.
Ok problem somehow solved. I or my IPS technic don't know what cause this four day dc problem, after 10.4 no dc or any other error, i run ping on backround and some time i see error on ping, usually 1 from 30-50ping attempt, ping is usually no hinger that 30ms, but sometime get higher that 100ms. After 11.4 i cannot tracert to server directly, last hop is 195.82.50.234 and not 195.82.50.54 i take that this is guard to DDOS attack? I hope that next time i get this problem, SE and my IPS cand find what cause this trouble.