Watch is unusable

Hello, after updating to the latest software (18.54) the watch has become completley unusable. I cannot track myself in any activity type, the watch just shuts down whenever i hit start. Sometimes it works but when y go t save the activity it shuts down again. I have tried everything, reset the watch, hard reset it, reset to factory settings, going back in software versions, etc.

Please help as it is usless if i cannot track my activities correctly and it is very frustrating that the watch does not work and there seems there is no way to fix it