So, you should probably open a TAC case in parallel. Wireless is a medium where multiple things can contribute to an issue and it does not get solved unless they are all dealt with. You have alot of things going on, so you should engage TAC so you can get help to deal with your issues in specific.
We can still answer your questions here, but we might not know enough, without seeing your tech support and a diagram of your environment, what is really wrong....
what software is used to view laptops from desktops?
Airgroup handles the multicast DNS and DLNA traffic that are broadcasts typically. It can turn them instead to unicasts. If it is an RF issue, theoretically all devices on that access point would stop working, but that does not mean bad RF and unfiltered broadcasts is not contributing to the issue that you are currently seeing...