I polish a lot of metal and once adapted a 3" flappy wheel to mine. Burned up the Dremel in a matter of minutes. I agree with the lack of torque statement.
I'm 43 and coming up on a year of full time detailing. I was part time for a few years before I retired from the Air Force last October. I was a helicopter mechanic during my time in so I am beat up but I've never let that slow me down.
Mine has the black specks, walking and a clunking sound. I have a total of about 30 minutes on it before it all started to happen. I had money to make so I gave up on it. I plan to call tomorrow and ask if other machines have been returned for the same issue.
I ran into the same issue with my XFE and went back to using my 3401s. I haven't found time to open it up and see what's going on yet. Have you found out the cause or a fix?
What rouge and wheels are you using? Cleaning your wheels between passes?
Soft aluminum is a pain since it holds rouge. Fill a old sock up with baking soda and lightly rub after each compounding step. Always rub in one direction only.
I wouldn't wax it since the wax can gather in micro pits...