Hi not2sure,
Sorry for delay in responding. This is not a long description at all. As long as we understand you, that's what matters.
Unfortunately, I'm stumped and I think others are as well. Could explain the lack of responses. (Psst. Greenbeen may be able to help out - he's a Pentax Tech. lol) I think this could be a warranty issue, but we need to do some brainstorming.
Trying to rule out static as a cause for the malfunction because this might not be covered under warranty. In terms of humidity, is your environment very dry? What type of clothing were you wearing? (that arctic fleece stuff - very static prone if you wear it with cotton)
Now working with the internals there is a bunch of stuff here. Hope not to overwhelm you. Print this out and use it as a checklist.
Does the problem happen in a certain focal range (zoomed in full tele, or full wide, or somewhere in between?)
Batteries - you mentioned trying different types - how old are they?
Working with the shutter button itself - do you push it very lightly and it happens, or sort of jab at it half way. Do you rub your finger on it? Yes, some people don't notice this.
What else can I think of? Oh. Is the flash on? Is it charging while you press it half way? Is the flash in Auto and it happens? Try turning the flash off and do it.
Lighting - Does the problem happen under dim lighting conditions where the AF light normally turns on? I'm flipping through the manual I found on-line. Try disabling the Aux AF Light in your menu settings. If the problem doesn't happen the problem is there.
If you get the problem happening consistently using one of the items described above, you can bring it back to the store where it was purchased, describe the problem and the situation in which it happens and you may get a quicker resolution.
Hope this all helps and good luck!
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