Brushless motor problems!!!

[j pearce]

hi, i have an LRP sphere comp 2007 edition (7.5) and last meeting the car was very strange. it started making a bit of a rattling noise and then that stopped. Now there seems to be a 'black spot' where if the flat on the shaft is facing up, i cannot get the motor to move. The red, yellow and blue lights all seem to flash randomly and the speed drops offto about 1/2 to 1/3 of normal. I took it apart and there appeared to be nothing wrong with the magnet (standard one, not sintered). Put it back together and it was fine again for 2 laps.......broke again....this morning i went outside and its fine!!!!!! WTF is going on???!!!

Help would be much appreciated! dont want to buy a new one if i can fix it!