Bug locked movement towards enemy base

Immediately upon the start of the game, my champion was sent towards the enemy base, not of my command. The interface was still operable (I was able to navigate the shop menu, and buy items, at least as far as I could tell. Selecting champions, towers, and the like were similarly functional), but I had no control over my champion. Upon respawn, the same command was given, again, not of my volition. The only way to fix this was to end League of Legends process, and get back in the game. This caused a feed of 2 to mid before for the game started, and easily cost the game (which demoted me to silver 2). No command given for movement or attack that came from me was registered during the time I experienced the bug.