I did read that the OP had stopped and restarted guiding. However, there is no way he could get such declination drift unless his polar alignment was significantly off and the mount was also ignoring corrections in Dec. from Ph.D.
Those two factors point to Dec. cogging.
The reason the sawtooth did not happen on its own is that his max. Dec. was set to 200, which is generally too low to make it jump back to the setpoint on its own. I've witnessed my mount ignoring corrections of 800-1200 in Dec. from Ph.D., if you can believe that. Increase the Max Dec. to 1600, and you'll get some nice sawtoothing without stopping and restarting.
The beta firmware fixes are good enough that I'd suggest upgrading right away, rather than waiting for the public release. Any bugs left in the beta firmware are way insignificant compared to the dec. cogging. I've only managed to "break" the beta firmware by deliberately misaligning the scope by about a degree. It otherwise worked great in 8 or 9 imaging sessions last month. If not for the fix, I would have sold my CGEM already.