HEX Champ Select "Not Selected"?

Just had a Hex game I tried joining. Had my champ selected and everything. Then right before the game was going to start, got booted and slapped with a leaver wait time? wth? I didn't lose internet connection, I didn't alt tab, or mess around to cause the issue. I just was booted with no warning. Anyone else have this happen?

Sidenote: I've had this happen before, but it has been a loooong time, I thought it was just a fluke.