It is as if the groove on the lug that the screw presses down on was cut a little too deep so the screw is not making proper contact in holding the lug in place. I'm going to try and add a little bluetac to the lug groove. Hopefully that'll work
rhaykal…does your version use the little metal sleeve on the end of the lugs? Sometimes these stay inside the case…sometimes they
come out with the lug end. If one is missing, it feels just like you are describing.
Worth checking…they are very small, and used on the KW V2's, but not sure about the V1's.
Other makers use plastic or silicone sleeve things, and when they tear or are lost the result is the same. They act like a spacer, and
without them the lugs are loose. KW's are metal. I lost one of these…..think the dog ate it.