Chosen Solution

suddenly all of the photos are very over exposed. I have reset the camera to factory specs but it hasn’t helped. Its like its stuck on an iso of 3200. The auto modes don’t help. Is it likely to be a problem with the sensor? The images are very pale with visible horizontal white lines very close together

Did you try selecting High ISO sensitivity? Also, set the White Balance to “Cloudy”. You can also set this option to “Daylight” as it is suitable for different outdoor conditions.