NS7 - High (over 1 second) latency and distortion after half an hour or so

Win 10 Pro x64
i7 7700k @ 5GHz
16GB DDR4 @ 3200MHz
Samsung 960 Evo NMVe SSD
Gigabyte Z270X Gaming 7

Nothing else plugged into USB ports
Tried all USB ports
Latest drivers
Latest serato update
Latest OS and dependencies updates
Nothing running in background
Disabled network and bluetooth cards
Tried different USB cables

Works great on the lowest buffer size for about half an hour then starts distorting, followed by very high latency (over 1000 ms). distortion goes away after a couple minutes but latency remains until the unit and pc are both restarted.
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