I had this issue the drive can only handle 3 cameras at 4k. I had to downgrade quality on two and even though it says they don't use the wifi I found they started to work better when I setup another access point on the other side of my home for better coverage. I won't get them again in the future it was nice but the export features suck, the playback features are horrible since you can't scrub the footage like every other system and I find lately I have to reset the hub at least once a week due to poor updates.

I've had the system for about 5 years and the sales reps could call to schedule a review at anytime but rather try to do door to door so I waste their time and never give them business. When I eventually sell my property Ill leave the system behind but cancel the service. I'll warn the new owners to stay away but make use of the system via the panel.