Mobula7 Power Loss Issues: Anyone Else Experienced This?

I dont remember if I asked the question here:

I bought one Mobula7 and it had major power loss and then crashed... I tough it was a freak and bought another one and same problem... major loss of power and crash... no explanation in the goggle or elsewehere. Anybody had a similar problem?

See here the normal flight then the slow loss of power and crash https://youtu.be/prcbGTkiM24

This is the first one... then the second did the same thing in the ally... could it be a battery prob?