Type of Bug: in-game
Reproduction Steps: Use the smartping menu several times.
Expected Result: the menu opens with normal DPI settings , I can ping just fine.
Observed results: occasionally the DPI skyrockets and my cursor jumps all over the screen.(it sometimes also goes to very low dpi)
Reproduction rate: roughly 1/15
I have read about this bug on other sites aswell e.g. Reddit ( https://www.reddit.com/r/leagueoflegends/comments/6glbh4/mouse_goes_in_random_direction_while_using_ping/ )
So apparently this has been a known bug for quite some time. I havent found any threats about it on the official bug report forum though so , I hope this can help you fix it , since it can be a mayor disturbance in-game.