“Why does my Reason software sometimes lose its MIDI connection when I switch to another MIDI application?”
Reason can sometimes lose contact with OMS if OMS is not set to run in the background.
To fix it, do this:
1. Close Reason
2. Open the OMS setup application
3. In Edit -> OMS MIDI setup, enable the ‘Run MIDI in background’ option.
4. Save and quit OMS setup
5. Launch Reason again.