Anyone experienced speed issues with Artemis Labs SA-1?

I have an SA-1 and have had one instance of a speed glitch but it was half a year ago and hasn’t recurred. I’ve also had two belts go but the second one was my fault as I’d put the splicing tape on the coated side.

thanks!
It was weird as it happened after a few LPs.
I did not listen since then, but checked the speed with the cell phone app and it did not drop.
I will listen tonight again and see if it will re-occur.

well I was very excited that the low speed disappeared during my next session a day or two later. Then of course after 3 LPs it came back...not sure but perhaps it is the power supply acting up?

The Artemis is a very thoughtful design which uses two pulleys, one to drive the belt and the other to push the belt up against the circumference of the platter so that the belt contacts the platter very nearly on its full circumference.  This is to eliminate belt creep and along with the noncompliant belt, it probably works.  Have you looked closely at the passive pulley?  Is there any friction in it at all, when you turn it by hand?  Could it be hanging up on anything? Likewise, can you check for bearing noise in the motor pulley? If the pulleys are blameless, then I'd think about the motor itself.  I always like to eliminate the easy stuff first.

Thanks!
Will check it and report back.
I hope i don't have a motor issue - it is a rare Swiss motor as I understand it and was developed for the TT. 
I hope not.