Motor6d laggy animations

Alright so I have an airplane with an animated propeller using motor6d.
The motor6d along with everything else on the airplane part is welded to the pilot seat and everything including that motor6d is given network ownership to whom is sitting in the pilot seat (the pilot).

But sometimes and not always, when the pilot jumps out, and the networkownership of the propeller is set to nil, the pilot sees the animations laggy, and sometimes but not always other players see it as laggy aswell.
BUT on the serverside the server sees the motor ALWAYS moves smoothly without interruptions!

Please help!

Pilot once he exits the pilot seat: