Having issues logging in - multiple Alliance members also reported.
Restarting the game says “check connection” or “login failed with Facebook”.
Most likely due server overload from the Galactus event.
Same trouble here. Game won’t load.
“Check Internet Connection” again. You’d think D3 would learn from their past issues, or at least have the foresight to do a stress test, but NOOOOOOO here we go again.
I’m getting the same issue; sign in to Galactus, error occurs. Quit / relaunch app = check internet connection.
Same here. I managed to get one galactus boss fight and one minion fight (jean grey essential) and BOOM! Check Internet connection! 
It’s literally Ultron all over!
Yup. Same here. So glad D3 learned from the issues during the ultron event so they wouldn’t happen again.
Lasted a whole 10 minutes this time.
Progress!
Click “Join” and next up is “Something went awry”.
I’m curious of compensation!
Maybe 250 Iso, 25 HP and a lousy token
Same here. Sigh
OMG AGAIN..!!
Yep… Ultron all over again. Was fine at 11:50am EST. Answered a question from a colleague, and now Check Internet Connection. 
This is very depressing… I have a lot of free time for this event I and I can’t participate… 
I’m sure they are aware, but I’m still going to submit a ticket, perhaps if they are inundated with them, they will actually, you know, fix the problem?
Same here. Switched from mobile data to WiFi, restarted phone…still no connection
I was trying to reach 1000 point in deadpool event. Hoofff 
I’m having the same problem!
same problem here!!! grrr
Expected this but its still upsetting
Yep, same here. I was OK for about the first 10 minutes, then nothing.
I’m not usually one to demand compensation, but I think it’s probably going to be warranted.