Hello,

I have Windows 10 Pro Version 1607

My Avast Free is uhm I have no idea really how to look, im very sorry, but it says Build 12.3.2280 (12.3.3154.23) in the settings is that what you meant?

I do have another Security Program namely Malwarebytes Premium 3.0.5

I have not tried a repair of avast or a clean installation mostly due too I thought that was already done due too I formatted and installed Windows 10 Clean not a long while back (only a week or 3 ago really) and the problem was before the format and after still. Before the format I had Windows 10 Pro Version 1511 always so it happened on multiple versions of my Windows I guess.

I have been keeping a track on it and noting when it happends and its extremely random. always at random times and always random days too. it can happen 2 days in a row or a day and then a week not and then it happends again etc.

I have done quick scans with avast and nothing was found and threat scans with malwarebytes and also nothing found.

I hope this info helps and I can be informed/helped about this

Very sorry if this is bothering in any way.