Hello Ben, I have an issue with my Smart Coffee Grinder BCG800XL: the motor is spinning with the high-pitch squeal, but the impeller and the conical burr are immoveable. What is the problem? It would be better to know it before I decide to disassemble the grinder completely. Thanks in advance.

Hello Ben, I have an issue with my Smart Coffee Grinder BCG800XL: the motor is spinning with the high-pitch squeal, but the impeller and the conical burr are immoveable. What is the problem? It would be better to know it before I decide to disassemble the grinder completely. Thanks in advance. Igor Kogan