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A friend purchased a Mazzer SJ (Mestre actually) and called me to set it up for single dosing. While we were dialing it in, we discovered the grinder stalls sometimes but it doesn't seem to depend strictly on the grind setting. By stalls I mean that when we start it with beans in the hopper, I can hear the motor run but the burrs don't rotate. In one of the videos the grinder was grinding but it was very slow and the sound it was making wasn't okay. I could also feel the grinding chamber get quite toasty. What could be the reason? The burrs are new and original, if this matters. [video=youtube_share;B0paB2UBR-M] [video=youtube_share;sTqYG582Jbw] [video=youtube_share;yrwqrg_sWSE]