We have had our camera for about two months now, and have had great success with it. Until last night. We powered up as usual an set temp to -20c. no problem it chilled right down in a few minutes. All the photos however show a "waffle grid" pattern on the bottom half of the frame. During the 2 hours of exposures, it slowly became a bit less but never dissapeared. This is dissasterous! What can this be? Frost? Noise fail? We have never seen a hint of this before. What do you suggest? Anyone see this before?
