Why does cqa test starting keep popping up on my phone? Why wont my phone

[Android Central Question]

Took my phone out of my pocket and it said cqa test starting, it stayed on in my tool bar until I rebooted my phone. A few days later it did it again but this time I had no service so rebooted phone and it's gone again. Now my phone is slow and sluggish and will not send or receive picture text