Thank you!
Router config is the sort of thing that I always have to meddle with on the fly, when I’m looking at the settings in front of me. My knowledge of it is somewhat ‘momentary’–oh look, that setting looks like it might work…and then I forget what’s going on afterwards.
But I’d bet there are some folks here who might know more about the specifics enough to help. I just wanted to get that out there as a possibility. Sorry 
My internet is fibre and I actually don’t know how to fiddle with it. I know there is a way to get in there. I did it years ago. But I no longer know what the settings should be
One thing that Zwift support would probably recommend, if they were to respond at all, is to make sure that both devices are on the same WiFi frequency. Your router probably supports both 5GHz and 2.4GHz WiFi bands. In some cases you might have one device on 2.4GHz and the other on 5GHz, and depending on the router this might cause problems. It shouldn’t, but it does happen sometimes. The solution to that is to get into the router configuration and change it so that both WiFi bands do not use the same network name (ie, rename one of them). 5GHz is faster but has less range, so if your training room is distant from the router, that might cause a device to switch to the 2.4GHz band.
Another thing to check is whether you have a network firewall running on the laptop. Companion depends on the ability to make a network connection to the laptop, so it’s not unusual for people running firewall software on the laptop to have problems with Companion connecting. This is a common issue with laptops provided by employers. If you have administrative control of the laptop, you can try disabling any firewall to see if that makes a difference.
https://support.zwift.com/en_us/issues-with-zwift-companion-app-HkWqU6hGB
Thanks- I’ve checked all that out. I also don’t have a firewall. I’ve been running the app for years without issue. This has only started happening recently. Nothing has changed here that I know of.
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A device randomly switching WiFi bands is something that could happen without your knowledge. It might happen due to external sources of wireless interference in your home - something completely unrelated to your Zwift setup. If you haven’t already separated the 2.4GHz and 5GHz WiFi networks into two differently-named services that might be worth a try.
I can’t switch from 2.4 to 5- at least I don’t think so. there is no option to do this. I have only a 5 GHz setting. I have fibre optic.