The cowl is held on by a couple screws. The motor mount is a single piece of plastic glued in or screwed in depending on manufacturing date. Take the cowel off, add some extra glue to the motor mount, or glue it if it is screwed in, check the screws holding the motor, add a drop of CA to all the screws before you screw them back in.
With any e-flite plane, you need to check all screws inside and out. The humans putting those screws in don't get paid enough to care.