No way to tighten them up, sounds (to me) like it’s normal if it has occurred naturally over a few days normal use, i’m sure you said it was a new unit, it’s hard to say without knowing what you are experiencing, get yourself along to a shop and compare, or put a shout-out here for local-to-you A4 owners !

I had a niggle concerning the height of a few keys on my mini-keys, but decided to keep the unit by my side, they’re hand assembled, and probably have some small variations - i figured that sending it back to be opened up and probably returned the same was too much hassle for me - i’m majorly fussy

actually, i don’t tend to wiggle 'em, but now that i have in the quiet of the morning i can hear the noise (perhaps) you mentioned, doesn’t worry me, i wouldn’t make a habit of wiggling them though, just turn and push

same noise on my older OT and it’s fine fwiw

try another one, i’m sure it’ll appease you