Random 10sec freezes

Since the last couple of day before the 10 years anniversary event I get big 6-10 or even **13 sec freezes**, that happens in game with no fps or ping changes or spikes. The weird part is that I get it **even in the launcher**, it just won't move and won't respond to any input for a couple of seconds. I tried the build in repair tool twice now, but no changes, it even got more frequent, I have like 2-3 min between the freezes. And no, the PC or the hardware is not the problem, I haven't changed anything recently and it's a beefy one that I use at 3D modelling and rendering, it can handle League. Any ideas?
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