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I have sometimes had issues guiding after a slew, usually assumed operator error. Once the weather improves I will see if this is present with my PMX.
Overall I have found my mount to be very stable, any failed subs have usually been caused by the guider getting a mind of its own, sometimes correcting backwards, yes calibration was correct and the guider functioned fine for a few worm cycles but it would suddenly send reverse corrections resulting in a drift on one axis. When this happens I just turn the damn thing off and get much better subs without the guider. I'm not saying you have a guider issue at all, just that I have found SB software to really bug out and randomly malfunction, not just the guider stuff. It wouldn't surprise me if there is underlying issues with what is driving the mount. Mechanical behaviours with motors etc could easily be compensated via software, tbh I would expect this and can understand why AP mounts compensate for it.
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