Dremel 8100 cordless

Submitted to Ask the Makers

 After my third purchase of the same tool, (8100), ive become curious as to what I’m going to need to make this thing work properly. The first two I brought home I returned until the current and third one I kept and thought the problem was exclusive to the previous tools. But it’s not. The problem seems to be in either the speed controller, or electronics-I’m leaning towards the speed controller as it seems to do better when I give it a detailed cleaning. I have some experience with electronics so I choose to do the repairs myself. (I know this voids any warranty). My inquiry is about replacement parts- I would assume these are available thru a web site? And is there any reports of this issue and how to correct it? Thanks for any reply’s.