Queue Woes

I'm not sure if this is something exclusively on my end (prrrobably is), but if anyone is having similar experiences I'd like to know.

Today I've been having a rough time with game queues, all of them. I'll click to play, navigate my way through the options, pop into the queue and...then it tends to go bad. A match will pop up, I'll click to join, and there seems to be a 50/50 shot at me either joining the game, or immediately being told that I've left the lobby/champ select screen - I'm unable to rejoin the game I had apparently left, and have to wait to try and join another game.

I clearly see myself having joined the game, and will sit there as the timer ticks down waiting for everyone else. Then, when all of the slots are filled, I'm left staring at the home screen with no further progress. But I've supposedly abandoned the game. Frustrating!