@safriddle What mouse are you using? Sadly, bluetooth mouse/keyboard is a hit or miss on UT. For example, my Logitech Triathlon mouse would connect fine and work in the first connection but once you reconnect, it'll exhibit the same behavior as what you described. Some I tried won't even connect or worst I've seen, won't be detected and listed in the available bluetooth devices.
In my experience, older BT (3.0) works better. BT4.0+ or BLE can be finicky. Logitech mouse and keyboard hasn't been friendly to UT in all the devices I tried. Rapoo on the other hand worked most of the time. They are cheaper but may not be durable 😅