Pretty frequent camera glitches

I have two cameras installed and of course they record a bit when the system is armed or disarmed.  Often when I'm viewing the timeline, I will see this flashing on the screen for each of the cameras.

No Video
We've lost this part of recording due to some internet issues with your camera.

It's on both cameras.  I have a 1Gb/1Gb fiber connection with a top of the line Netgear router.  Sometimes I am able to actually play the videos and sometimes I just get a black screen.

Any ideas?

Thanks