Hi Aaron, hi George,
I encountered the very same situation last night, and a few nights before, and some weeks ago, too.
Balance was good, but with 1,5A values, supposedly due to the weight of ASA12N+CCD-Camera+Filterwheel and balancing counterweights.
Last night I noticed, that the red led of the laser switch at the RA mount baseplate blinked, when the problem occured.
Though I stopped Autoslew, disconnected and unpowered the mount, the blinking red led showed up again after powering the mount. When connecting USB, the blinking change to usual contant light, but the tracking problem occured again after a few minutes.
When the problem started, the mount began to make some strange noise like jarring, buzzing, rattling. When tracking stops eventually, it seems like the motors are not powered any longer, and the button in Autoslew, for turning motors on an off, has no effect at all.
Maybe I have to inrease the "Measure Time", and decrease "Step Size" and "Test Current" to get a more sinus like pattern (which is not so up to now) when setting motors on in Autoslew after powering the mount ?
Which values do you have with a rather heavy tube (and thus counterweights, or counterweights near shafts end) ?