I'm getting on average 1-2 images per night that have a glow in one corner. I can't find any pattern to this. Any thoughts on what might be causing this?
Looks like amp glow - as if the readout amplifier wasn't powered down during the exposure. If I had to guess, it might be some kind of rare firmware glitch. Unfortunately the STT firmware is no longer under active maintenance. Given the rarity of the problem I recommend that you simply toss out the occasional bad frame.