T22P Display cycles every 10 seconds

I have a couple T22P phones, I have flashed the latest firmware 7.73.0.50 (I'm not sure when you would use the 193 version. I am using them with FreePBX and everything looks to be going well but the display annoyingly goes to the Yealink screen every 10 seconds or so then back to the normal display.. any ideas?

Thanks