This is not an uncommon issue it would seem, several HTC 1 users have run into the same problems, HTC has officially acknowledged the problem and believe that it may be a firmware issue with the phone. This was acknowledged last year, if you can, I would see if there is a firmware update as HTC believes it is a software issue. If you cannot wait and you are still under warranty you should be able to ask for a replacement if it is in fact the issue.
Also I would try to lower the ISO levels. HTC is advising users to reduce the ISO levels to lessen the impact of the flaw, or return their handset and receive a replacement.
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