The black streaks are from "point source edge flare" ie bright lights on the image edge, particularly at night. Though I have managed to replicate quite easily in daylight. They manifest as thick dark bands...really not white light like real flare.
So to stop this problem don't have bright lights on the frame edges. Other camera sensors have this problem too sometimes.
Although I live in a warm climate (Australia) this problem, I'm sure, is nothing to do with camera use temperatures.
cheers Dave S