Uwatec Air Z won't start unless diving

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Hi All,

My faithful Air Z has finally started playing up, I can’t start it on the surface, but it will start with when I dive, I have cleaned it with hot soapy water and that didn’t help, anyone know any other tricks to try?

I have tried the wake up function in Data Talk and it reports a connection error.

For those that will ask, the first dive it failed I had my bottom timer with me so I continued with the dive, when I got on the bottom I looked at the Air Z out of habit and discovered it working, it has now done that for a second dive.

Thanks for any help
Brendan