Thanks for hints guys!
I've sorted out that remote control software was causing those glitches (even in standby mode with no connected clients). After switching to another software glitches are gone. Thanks again!
BTW
Some time ago I was asking about madvr playback freezes with unstable IPTV UDP streams by my local internet provider. I was able to avoid them by enabling UDP proxy on my router and forming new playlist with http streams instead of UDP. First few seconds of playback are still a painful spectacle with artefacts and glitches but at least it doestn't freeze now.
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