I am having the same problem with one of my m-880s. I went and checked my camera last night and as a walked close I noticed that only the left half of the LEDs illuminated when it takes a night photo. I am now curious if any of my other m-880s are having the same problem. I know the one I replaced the faulty one last night with is working properly. So, do both of your cameras have this problem where only half the LEDs illuminate? I have my camera set on the default setting where it is just taking motion activated photos and I still have this problem. I dont know how long the problem has persisted but the night photos the camera has taken recently seem to be okay, not too dark. How do your night photos look when only half the LED illuminate?
Have you discovered a solution to getting this fixed? Could it be the batteries or SD card maybe?