Universal Control has been broken too long

Still not working, and I've tried everything, I even created a separate 5ghz network (it's own SSID) just for those 2 computers and the mouse still disappears and I have to open display settings to get it to reconnect (no amount of moving the mouse on the host machine to the edge of the screen re-enables it). I thought I found a workaround this morning, by using just the LAN on the host machine, disconnecting the SSID, but keeping the wifi adapter on (you have to have the adapter at least enabled, even if it's not connected to a network). And still the connection has gone out about 4-5 times today. I think the problem might be the Mac Studio (M1 Ultra). I've seen tons of threads about the terrible wifi and bluetooth on it. And from the first day I opened the box and used it, it always had a problem getting that initial connect to the keyboard and mouse (over bluetooth). I would boot up and move the mouse or type and had to wait like 10-20 seconds before it connected. My iMac never did that, it was connected almost immediately on boot. So it's no wonder Apple has swept this under the rug, there might be a hardware problem and they don't want to do a recall.

yep, found that one too, and tried all of those steps. I even went so far as to completely wipe and reinstall both machines I was so desperate.

I use it all day, both machines. MacBook is up on a riser so it would be tough to type on and use the track pad. It's really hit or miss if you just do a cursory search on the net you will see this is impacting some unknown percentage of folks. Is it 100%... I doubt it? It is maybe 5% of edge cases? Probably more accurate. Should the root cause be investigated and fixed? yes, please and thank you.

Most likely. The funny this is I don't really have a lot of bluetooth stuff running. I do however have dozens of smart home devices running on 2.4ghz wifi and 2.4ghz Zigbee. Yesterday I split my network up so only the Mac Studio and MacBook Pro were on their own 5ghz SSID (still the same network, just a different AP name and forced to use 5ghz without switching). So far, the connection has stayed (but I did see some really laggy mouse movements). I'll report back if this fixed it, but this isn't a true fix as Apple needs to build a fail-safe for bad connections (reconnect, etc). Otherwise it just lets the mouse cursor and connection disappear without trying to reconnect. I'll report back if this worked.

Already did that (multiple times) and I mentioned it in my original post, but it was removed by the moderator because I mentioned the beta program.