One thing I have found about the Dreamer extruder, running an unload routine after an idle period can cause a jam at the driver gear. After disassembly looks like the filament gets a small ring or collar of hardened plastic near the top of the heater zone, maybe .5 inches from the end. Even though the ring is small when it hits the driver gear it jams. Solution is to always run a short load first until a small amount of material exits the nozzle then immediately switch to unload. Seems to allow a smooth tapered filament end that passes through the gear fine.

Not a direct solution to your problem but related.