New Seestar, updated software and firmware. When I first started using it, both slow and fast slewing worked as intended. Now, after a total of about 5 minutes of use, fast slow works normally (with two speeds depending upon how far I move the virtual joystick) but slow slew just hums in both axes.
No grinding, no straining of hum, really, just the mild hum. Certainly don't want to damage anything, though!
Yes, I've cycled the power and re-set the connection multiple times. Amazing device, otherwise. I'd like to know what's up!