Can anyone tell me what's going on with these analytics?

We've been using the Nanit since our son was about 6.5 months, and he's 14.5 months now. We've never had any issues with connectivity or anything. Recently I've noticed more and more incorrect reporting of sleep analytics - especially Nanit marking him as 'asleep' when he is clearly awake. That, I can deal with. 

But this was last night.

What IS this? He wasn't awake for nearly any of those 'awake' marks. Also, what are the frequent blips that look like disconnects? But are vertical hash marks when I thought disconnects were horizontal?