Sions abilities stop working mid-game

I've had it happen the two last ARAM games I've played with Sion, late in the game (past 20-30 minutes or so), his Q and R abilities just stop working. So far I haven't had it happen in any other game modes, but maybe someone else can verify it? Tried to find anything about it, but didn't get a hit in the search engine that I could understand :) So just thought I'd make a thread to be sure. Last time it happened was just a few moments ago, February 22, Sunday 1ish AM GMT +1
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