I would agree in the comment that 5G should not impact the connection to the devices - that's more of an app/software issue vs the speed at which your phone is able to operate.
If its a new phone the first thing I would check is to make sure the phone itself is up to date with the latest version of Android. Then make sure the app itself is up to date. Those are the easy things to check.
Then check 1) connect while on the wifi network as the cameras (if you can) and 2) connect while the phone is NOT on the wifi network as the cameras.
This is only going to help narrow down the problem and not necessarily fix it. but hopefully its a start
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