Being exited out of quest for no reason

Elk_

I was forced out of 7.4.6 "No Tomorrow" for no apparent reason, I had gotten up to the 3rd phase of the final kang boss when I had just gotten really upset as I was struggling a lot and using lots of revives and units. So I decided I would go onto my second account to make some progress on there and blow off some steam before returning to the Kang boss, after switching from that account to my main I ran into an issue. When I went to the quests there was no option to continue and thinking it was just a visual bug I entered the quest thinking all was fine until it wasn't and I realized that it forced me out without me exiting out myself. This reasonably made me upset since it would be a huge progression in my account and also I had spent all of my revives I spent a long time grinding for just for it all to be wasted. I am not upset or mad anymore as a week of grinding arenas and revives should put me back into the same position I was, I just wanted to come on here and talk about this.

Is anyone else experiencing this because I know for sure I didn't exit out of the quest myself?
Thank You