Iphone 12 Pro issue?

Bought iPhone 12 Pro Max yesterday. Did my first ride today on Zwift. Riders frequently disappeared and companion app would go to offline mode. I am a level 50 Zwifter and did not have these issues before the new phone so suspect there may be a problem. Could also be IOS 14.2. Anyone else?

Bought iphone 12 mini and Zwift locks up in main log in screen. Deleted and reinstalled app and same problem. Works on my iPad just fine. All software is up to date on my phone. I am level 29 and never had issues with prior iPhones.Any ideas???