Do other people have a problem update nexus 7 2012 Mobile to andriod 5.1?

[AC Question]

I just did factory image to 5.1 and now having a problem with phone signal disappear. I have to shut down and turn it on again to get the signal back and it did disappear again.

I have this problem when I update to 5.0.2 then I downgrade to 4.4.4 and it fix now I update to 5.1 and this problem come back again.

Did other people have to same problem as me?