instability

I have Mavic with 2.30 mins flight time. Today after circa 30 minutes i got a serious issue which made me land the craft immediately. The Mavic is vibrating as if something had happened to one of the motors. I i thought ir was the extra prop guards that caused the issue, but no. Changed to new...

I was at a shoot yesterday, inside a home. No electronics around, no cordless phones etc, computers etc. I wanted to take a panorama but the mavic was drifting 2 feet here and there and climbing and descending 1 foot, I at VPS on, and OBS off. I was using LITCHI. I gave up on Junior and set...