Universal Control is an awesome newish feature of MacOs/iPadOs. I’ve had a personal computer on my desk next to my work computer and have been frustrated because it’s been SUPER intermittent.
After doing some searching in the Console app (all the system log messages), it looked like it was very sensitive to Bluetooth interference. So even though everything on my desk is only a foot away or so, I decided to do some re-arranging and now my computers are within inches of each other.
Time will tell long term, but so far that’s done the most immediate good. They show up immediately and the link works fine which is WAY better then it has been in months.