Game Crashing on Howling Abyss (ARAM)

I just played a 19 minute 30 second long game of ARAM as Gangplank. My game crashed 4 times with no option to open task manager and end the process. It just froze, no audio, everything else (i.e. Discord) was working fine, no lag at all. My ping was a consistent 30-35 (normal ping for me) and my FPS was a steady 80. Please fix this bug, thanks.