Yesterday the P2V was all ready to go up. Everything was ready, 8 sats. Started the motors. Within about 5 seconds, one of the motors stopped for a fraction of a second and restarted. If not looking at the quad I may have missed it. So I waited and watched. It happened again. Still waiting and no problem. So I popped it up 10 feet and brought it down to 5 feet and waited at least 5 minutes. Stayed right in place, no problem. So I sent it out 900 feet or so and looped around and came back. Went just fine, no problem. Landed and shut down. Think this is the start of a motor or other parts problem? It has never hit the ground as in a crash, but has bumped a cedar tree many flights ago.