There is an issue with the way the game runs. Anyone witnessed it?

This is very weird to explain without seeing it however I need to know whether this is a problem with my computer or people have seen it. So for some reason in game at some specific points(I couldn't tell exactly when or why) the game speeds up for every champion. The speed of every champion increases but using abilities causes it to become really buggy. I wanted to know if anyone witnessed this on the EUNE servers or EUW servers.
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