There is a new firmware version - upload it and see if it helps. No idea what could be causing your problem otherwise - I have two of those cameras and another two being delivered next week. They are fantastic.
I'm so impressed with these 2347's that I've installed another one today - and ordered another two to replace some 2355's I've had for 3 years. The low light capabilities of these cameras are beyond my expectations. They blow away my 2355's and 2385's.
Andy, maybe these images will help. The first pic is from a 2355 5mp at midnight, with a streetlight about 100 feet to the right:
This picture is with an older 2347G1 4mp at midnight. Huge difference. I would assume the G2's are even better.