Hi all!
I found the reason for my """""problem""""": Firmware-updates!
WHAT?
Yes...Firmware-updates!
Right after I received my DM42 there were two firmware updates, which I immediately flashed into my DM42 (of course!
This bends the the metal of the little USB socket of the DM42 a tiny little bit.
At this point I hadn't opened the case and everything fits well together.
Then I opened the case...lable with my name...bla...close the case...screws...bla...you know.
And The Horrible Squaeking Monsters from Mars begin to invade my Planet DM42.
So I need Plan 9 from outer space...
Open the case.
Closeing the case:
Now - after fitting the noses at the bottom into their holes (...no human being can do this...

and wiggle them into their places
(THANKS FOR THE PHOTO, GRBANKS!) close the case. When you press down the part of the case, where the holes for the screws are
to close the last mm of the gap take close look at the infrared LED. If it does NOT move, while the frame of the calculator moves,
you are also affected by this problem:
The "lip" of metal part of the tiny usb socket rests on the border of the hole for that usb socket in the metal back and cannot move away from
it. This puts stress on the PCB when tighten the screws.
How to fix that:
Open the case a litte again and press the plastic frame gently towards the noses and while pressing close the case again moving the metal
of the usb socket away from the border. The socket must be completly behind its hole and completly INSIDE the case.
After that the case can be closed without gaps again and especially without bending/stressing the PCB.
At least for me this chases away the squaeking Monsters from Mars.
I hope Plan 9 from Outer Space will work for you too!
Cheers
Meino
DM 42 - SN: 00373, Firmware release v.:3.16. / DMCP 3.20. as compiled by SwissMicros