It looks like I solved it. It happened exactly as following: I played a bit with "Generic PnP monitor" drivers in device manager. I tried to install a driver manually and choose driver from the list with resolution 1920X1080 60Hz. That didnt help it was still changing all the time, so I removed it, it was back again on "Generic PnP monitor". But after a restart suddenly I had 2 monitors connected, despite that nobody touched fisically anything. I could choose from teamviewer wich display I will see. And in properities in windows it was set in "extended" display mode. In device manager i had 2 monitors installed, one "Generic PnP" another "Generic non PnP". But changing of resolution didnt happen anymore on any of them 2 wichever I choose on teamviewr to look at. I removed/uninstalled non PnP, restarted PC and everything was back to normal. I have one monitor connected and no any occasionally change of resolution!
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