Are you seeing your micro adjust move towards coarse when grinding?
If you notice your micro adjustment ring moving toward the coarse direction, tighten the three screws on the bottom of the adjusting ring. To do this, remove the adjusting ring and burr and turn it over to see the screws, tighten the screws (if already tight, only tighten a 1/16 of a turn further) and re-install the adjustment ring/burr and you should be fine. Do not over tighten the screws or you risk stripping the threads.
If the issue persists it may be because there is insufficient friction between the micro adjust collar and adjustment assembly. This can be solved by replacing the friction felt which our support team is happy to provide- please contact us at email@example.com.