It`s most likely the battery. Mine did the same with about 50% battery life left on it. Scubapro/Uwatec will tell you that even though there is loads of battery life indicated, it all depends on what kind of diving you do (ie cold water) and if your style of diving activates the audible alarms a lot.
I had to have mine changed late last year. I sent it to Scubapro. It took a week and cost about £40
Steve |