Can you post examples or a video of the shaking?
If you take photos with tripod, turn off SR. If you have a lens with stabilization (some Sigma have it), turn off one or the other (do not use both in-lens and in-camera stabilization at same time, they fight).
If you are panning and taking photos of gently moving things, turn off SR.
SR has different Menu options, you can turn it to always on, only on for photo, always off. I have it "only for photo". I think this option only affects live view.
Pentax video quality is not great, so there is some jello effect. The SR makes this worse, but even if SR is disabled, the codec and shutter do this anyway. To combat this, use the appropriate shutter speed and high quality, and turn off SR. In video, the SR is digital with modern cameras - it is not the same as the mechanical SR for photos.
When taking SR photos, make sure you have the right focal length (with manual lenses you have to input by hand). You need to hold the shutter button a little bit for SR to become fully active. There is a little icon in the LCD that turns on to tell you SR is full active. If you do not wait for this, the SR will be suboptimal. IF you dont have time to wait for this, press button earlier, or disable SR.
Holding camera and pressing the shutter button gently is very important, too. For long time I had shaky photos because of bad technique. Working on stance and pressing button correctly helps a lot. And wait for two seconds for your heart rate to slow down, for arms to be steady, before taking shots.
If these tips do not fix the problem, reset to factory defaults, make sure camera mount, SD bracket and battery are clean. Do a firmware update to the latest version (only newest one, for your camera model).
If none of this fixes it, if it is not a user error and not a camera setting error, you might have to return the camera. Hope it is in warranty. Good luck!
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