Might be interesting to see that thread! 1EV sounds a bit excessive so it could be user error / weird settings or semi-incompatible lenses. Could also well be a mechanical or hardware issue if the camera does this consistently.
Let's start with:
-Some sample photos
-EXIF information, lens, shooting mode
There are several threads on our forum as well where it ended up being fixable
Pentax K-3 Overexposure Problem - PentaxForums.com Random overexposure problem getting worse! - PentaxForums.com Adam
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