Cant connect to cameras

I can no longer connect to my three 720p wireless bullet cameras using their IP addresses and this app. However, I can still login to them via the web browser on my Mac, so it must be this app. Im not too impressed by Amcrest products in general. Their cameras perform poorly over the wireless connection and the NVR is very slow, even though its connected via a 1Gbps Ethernet port. The cameras and NVR drop packets during ping tests and the latency is in the 100s of ms (400-900ms), which isnt great. I dont know if poor hardware, firmware, or both are to blame. Ill probably go with a more reliable brand next time, even if that means spending a little more. My time is valuable and Ive spent enough of it already trying to figure out their poorly designed camera firmware by reading their vague user manuals.

Update: I can connect to the cameras through the NVR, which is an acceptable workaround. Due to the cameras poor wireless performance, Ive had to reduce the frame rate to 10, change CBR to VBR, and record on the substream channel (SD quality), leaving the main channel (720p) to take snapshots only. These cameras simply cannot stream 720p video at 30 FPS over an 802.11ac fast wireless network. Are the cameras even 802.11g?

Cmassey84 about Amcrest View Pro, v3.40.0048