I’ve recently had a Hikvision 8MP 4k camera set up installed, with an always on display enabled on a tablet. It’s been working fine but today I cannot view the multi camera split screen on HD as it is greyed out. When I change view to single camera then it automatically changes it to Hd, but when I change back to a 4 camera view then it goes back to SD with no option to change. Anyone know why this is as it’s been working fine for the last week? Thanks