Vex V5 Motors bearing weird

My motors for the intake of tower takeover are being weird. One of them ends up stop working and makes a screeching sound. So I opened up the motor to see what was wrong and that fixed it but after putting the lid back on after a little the motor stopped working again is there a reason for this.

What did you find was wrong with it when you fixed it?

Also, you’ve categorized this thread under “Chit-Chat / Rumor Mill”, which a lot of people completely ignore. You should probably move it to “Technical Discussion”, also under “VEX EDR General Discussion”

Did it make a high pitched whining sound when you power it? Try removing the gear cartridge and run the motor without it.
Bc one of my motors broke that way