comradecereal

Hi Guys I've had my DVR up and running for around 1 year now and at first all the images from all 8 channels were amazing, They have now started to go down hill with the images being grainy/pixelated or blotchy both during the day and night as you can see in the image some images are good whilst garage, driveway right house and left house are not as sharp as i would like. Any advise is welcome

Ive checked the connections and they seem fine, I am using the Swan Pro-510 cameras, not sure if you can re tune the lense? This is all kinda new to me.