Every now and then during a print, the print will stop, and the nozzle will touch the back right corner of the build plate and then go back printing. Does anybody know why it does this? It normally happens on longer prints.
Do you mean the automatic clumping detection feature? If a clump forms on the nozzle, the system will detect it.

That must be what it is doing. It does it about every 10 min. Not sure how much filament that is. the article say it does it every 8g Just like in the article I have stings.