It's unlikely that the motor "stalled". Other causes such as the speed control are better possible causes.
If it really did "stall", I'd expect to find a hot motor and/or burnt smell.
Such things as a poor or intermittent connection, are likely causes.
A loss of throttle control signal from the receiver can cause the speed control to shut down the motor.
If the speed control has a built in BEC, a weak battery under full load may have shut down the BEC and speed control.
In some cases, a built in BEC may not have the current capability to drive the servos.
We had this happen with a 3A built in BEC driving six miniature servos. All of a sudden, control was lost on everything but
the two aileron servos. At least the other servos and throttle reverted to fail safe conditions, and the plane was saved using only the ailerons.
An external BEC was added, and the problem never re-occurred.

Since this is a ducted fan, also look for mechanical causes, such as stiff or sticking bearings, or scrape marks in the housing to blade areas.
High RPM motors don't have as much torque as a lower KV motor of the same power.