Band jumping 3-20

[Cenimm]

Why is the phone jumping to b3 all the time? I have band 20 then is going back to 3 for 10-15min then it change back to 20for 1min and then go back to 3 and so on?

[Cenimm]

[Anders_ASUS]

I will have to log your phone to find out why. I'll send you a PM with instructions