I've just had my Pentax K-50 returned to me after a warranty repair. It now clunks when rocked from side to side, as if there is something loose and unstable. I do not recall it doing this before I sent it away.
Repairer says it is the Stabilisation Unit and is normal.
Does your camera clunk when it rocked from side to side?? Should I accept their explanation??
Heree's one: https://www.pentaxforums.com/forums/58-troubleshooting-beginner-help/94122-beginners-question-about-noise-clunk-pentax-dslr.html
I'm not a Pentax Person, that's all the help I can provide!