I can't provide any input on your theory, but the whole SDM failure issue is mind bending. I have a 16-50 that I purchased in 2016. It ran flawlessly up until last spring, and has slowly deteriorated since then to "sleepy mode." After I get it to wake up, it runs fine, but let it sit a few days/week, back to bed. Whatever is going on with these, electrical or mechanical or a combination is nutty, or should I say the lack of response from Ricoh is. Someone must know all these answers, and why a fix hasn't ensued is a puzzler. Just a motor that is too small for the mass of the 16-50, and hence why it is the most frequent fallure? But why does it wake up and then go fine and using it on a daily basis keeps it happy? You'd think a motor that is toasted wouldn't respond favorably to a work out.