MGI ZIP Navigator will not Start. Any odeas

Hello,

I charged Battery of my MGI ZIP Navigator fully, Trolley works well till the range, roughly 300 meters, from Range to Tee 1, roughly 250 Meter. On the way to the tee 1 the display started to flicker, went off afterwords and the trolly didn't work any more.

Any ideas? Is there a reset by myself possible?

Thanks

Patrick