Sounds to me like someone already suggested....a timing issue.

Your ESC should come with an instruction sheet that tells you how to program each feature of the ESC.   Motor timing is one of those features.

I cant recall right off...but there are usually 3 different timing option settings, one of which would be the most appropriate for an inrunner type of motor.

With a little more research on your ESC, Im sure you will be able to find out which option you need to select.

I know that Ive had some motors make a terrible loud/hi-pitchy "screeching" sound like it was "stuck" when Ive had my timing setting not set correctly.