Thank you to everyone for your help. I fixed the problem, which was basically my own doing. I discovered my desktop had an Ethernet connection. I disconnected that and used wifi only. The wifi works smoothly on all my devices. I should have been a little more diligent before even posting here! Anyway, thanks again for your time and for your assistance!
WOW, that's pretty odd!!
I would have thought that would be the complete opposite of what you should have done. My guess is that in actuality your ethernet port or cable is flakey.
Whatever, you're happy with the result and that's all the matters.
Interesting find. I would be interested to know if a NIC driver update and a Chipset update helps to resolve that issue. That could be the sign of a bad NIC, but I have seen Windows and some drivers be a little overzealous with power savings.