Zwift app crashes during groupride

Today i went for a groupride at 19:00 swedish time.
After 3-4 min the app crashes.
Started the app again and came back in the group.
But after 4-5 crashes, 3-4 min apart, I have upp.
Did a singelride instead and that worked fine for 45 min.

Whats wrong?

I have 100 mbit fiber internet, using iPad Air 2016 and have full wi-fi reception.