no resource

I have a 16 channel camera system. I lost power a few times yesterday and when it came back today on my main screen where i watch all 16 cameras only 4 of them show and the rest say no resource. However when I click on them they all work, just not on the main screen. Anyone know how to fix this?

On playback on the DS-7608NI-I2 when the photo thumbnails appear under the main playback image, instead of the thumbnail photos I'm getting no resource on all of them. This is playback on a single channel only. NVR has 2 WD Purple 4Tb drives and the system has only 2 x 4MP Hiks connected so...