Team Builder problem, constant D/Cing

Hi there, I think I found a bug? So I've recently came back to the game and started playing, and every time me or my friend host a Team Builder game, as soon as we get a full team (or a bit earlier). I D/C and the room drops, but the only thing is I'm still in the room. But I'm not allowed to do anything it says GROUP_NOT_FOUND or so...

And it's been happening for the pass 8 days or so, including the recent patch that happened yesterday or so.

I've already reinstalled my whole client and that has not helped yet.

**TL;DR Every time I play Team Builder, I d/c within 2 minutes of joining the room, reinstalled client, nothing has worked, please help. **