Complete Freeze experienced in game, requiring me to hard restart my PC...

Hi all, Lately, over the last three weeks, my LoL has been spazzing out. Whilst in-game, my league freezes completely, to the extent i cant minimize or even launch task manager. Instead, i need to restart my pc and log back in to continue a game. it happens once or twice a day. Any idea what might be causing this? When restarting, i get to the screen which says "the following programs are preventing you from restarting..." of which LoL is the only program in the list. I am running league from an HP Omen, with all drivers updated. Thanks in advance
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