Early problem(s) starting?

[Happyflyer]

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.

 

[Geoelectro]

I would check the feel of the motors by hand and consider opening the suspect motor up and inspecting. Since these are open frame motors it's possible for something to get lodged inside and causing the motor to stick. Especially any metal pieces since there is a strong set of magnets inside.

Geo