Unfortunately, I had now but dust in the lens ... I thought I do not really.
I was once out there so while it was not operated on the ground or sontswie mistreated.
Otherwise only apt.
So back to the dealer and simultaneously written to Panasonic.
The answer was sobering.
The usual please excuse and we bedauerern the thing very, but then it came.
"Please note that this camera is not dust-proof, splash-proof or waterproof.
Avoid using the camera in a very dusty or sandy places. "
I thought that's a travel camera (Traveller Zoom) .... which makes Panasonic the Lord his travels ... in the clean room.
Unfortunately, the TZ25 is definitely not a travel camera and unfortunately this problem, other models such as Panasonic have probably the FZ150.
Everything read when. Times google for dust + Panasonic and Lumix Forum