[Gameplay] Unable To Stop Moving Towards Enemy Fountain

The ling above shows the match history of when this happened.

In this game, we had barely loaded in when my team's Sona found herself unable to control her champion as it moved towards the enemy fountain. She was executed by one of the enemy midlane turrets, and respawned, retarting the process. I (Varus in that game) told her to leave because I had seen this happen once before in a video of a popular streamer where then only fix was when he left the game then reconnected. (If i had the link I would add it but I can't remember who it was at this time.)

How to reproduce: Queue to any gamemode on Summoners Rift Load into game with any champion Wait to see if it happens, or try moving. If it happens, disconnect and reconnect and it will be fixed.

I've only seen it happen twice ever, and only on BLUE SIDE. It also happened both in Teambuilder (from my experience) and Ranked (if I remember correctly from the streamer's video).