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dont know if it is any use, but I saw a similar effect when the wiring to my Peltier failed - however, in my case it was only transient, occuring on one frame as the chip heated up.
Might be worth a look at the cooler and its connections/power supply to make sure that it is drawing reasonable current - could be a high resistance somewhere in the circuit or maybe the Peltier itself has partially failed. If it's not light leakage, it must be heat. all the best Ray
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