ANNOYING WALKING TO ENEMY NEXUS AUTOMATICALLY BUG

Okay as the title says, it's basically like that. This has happened to me a lot of times and it's costing me my games so I kinda thought that the next best thing was to write it here.

So what happens is once the game starts, you go Summoners Rift and it just straight walks you down mid lane into the enemy's base and into the Nexus. On the minimap there's a line showing that you're walking there, and the worst part is you can't do anything about it! Well you can at least to stall it by pressing B, and it stop there and let you back but once you're back at your base it automatically starts walking again.

Sure there's a really quick fix to it and once I could quickly identify the problem all it takes is just a simple reload (quit game and come back in) BUT sometimes the reload takes so slow and when I come back I'm like 5 minutes late and the enemy team is like level 4?

I saw this happened to a streamer before in a video on YouTube but I forgot whose one was it. If anyone has ever experienced this before please say something here, so maybe they can do something about this?