Minimum specs for phone?

I have 2 cams and a laptop on a home network, basic Xfinity cable internet. I also have Bluestacks installed on the laptop and Alexa on a Fire stick. I have four or five cell phones, of which a couple are on the network at any given time. The Wyze app runs on all of these, except it never works for long on any of the phones, dropping out to attempting to connect or failing to connect within minutes. Power cycling and so forth have made no difference.
There are no such issues with Bluestacks or Alexa, so this must be phone related. Is there some minimum spec I’m overlooking? All the phones are Android and routinely updated. Advice/thoughts appreciated, thanks.