Alarm type sound on the Phonak Roger Focus

I use a Roger Focus in my right ear with dome for night time to listen to the radio.

Last night I woke up not hearing the radio but I heard an alarm type sound that didn’t go when I turned off the radio, took the Roger Focus out of my ear and I couldn’t hear an alarm.

The alarm type sound only went once I turned off the Roger Focus and back on again.

I listen to the radio via my Roger Touchscreen.

I was using the Roger Focus all of yesterday as I didn’t leave the house and was watching TV and all last night.

It wasn’t the battery warning.

Anyone know what it might be?

EDIT - it might be coming from my Touchscreen?

EDIT - I bought my Roger Focus off eBay but it’s a 2017 serial number so don’t think it needs to be serviced.