While viewing live or recorded footage the camera has developed a thin black line in an arc shape, this is the second camera now that this as happed to, is this an issue with the senosr on this model

I have a notification to update firmware but it always fails , been trying for a couple of days but it always fails with both wifi and hard wired with the same result.

The sound quality on my c52ows is very poor , its quiet ,muffeld and intermittent, i can't even hear a car passing by. In comparison i can easily hear people talking in street on my igeek camera. Adju