Originally Posted by RiceHigh 
Maybe, but unlikely, I guess. It might be that the new firmware is not fully compatible with some different versions of the hardware including the body and/or lens.
My advice is if problem persists, just contact the Pentax UK's for servicing or technical support. I think his lens and body are both under warranty.
Sometimes those firmware upgrades could create new problems, so if it is not really needed, don't do the upgrades.
I am going to say this as nice as possible,
Come on Rice the chances are way more likely that it is the contact and not the firmware.