The new PPS is a bit more user friendly, but the thought of having to start from scratch isn't too appealing. I hesitated at first, but I'm glad I made the switch. If your profiles only have a couple of zones, it really isn't too bad.
Do you still have the firmware installer for V1.33? If so, you might want to try a fresh install to rule out corrupt firmware. Otherwise, you'll probably have to send it in for repair, or replacement. If it ends up getting replaced, you'll probably be getting a G5N. In that case, you will have to upgrade to the new PPS.