Nice, but lock-up reliability problem

Still camera pics very good under most situations...suffers slightly under lower light levels (grainy). Nice features, very compact. Quick power-up. LCD screen too tiny, though. Flash good for a subcompact. Video camera is useful only for sending clips over the internet...not even close to a replacement for a real video camera. The BIG problem is reliability. Camera began locking up in camera mode after only 15 months...lens, focus, "take-picture" button, etc...serious processor issues is my guess. Fortunately I bought the 5-year Mackcam.com extended warranty. Otherwise the repair cost on this $260 camera would be $175! I would never buy a Pentax compact again. My wish list: Canon SD400 or SD450.