Accessing and using Microsoft Teams on smartphones and tablets across platforms
I think I found the reason. This worked for me either with Wifi on or off.
For me, everytime Teams kept refreshing, I noticed an "Yammer" icon that kept switching between enabled/disabled (within the Teams app).
I went to the Yammer app on my Android phone and stepped through the login process.
This enabled Teams to link with Yammer.
Now the Teams stopped refreshing in the loop!!
Pelase check if any of Teams are integerated with OTHER apps. You will need to login into those.
Hope it works out for you.