Direct Folders shuts down at random intervals

Long time user. New computer with Win11 Pro and all the latest updates.

Direct Folders 4.2 will be working OK, then without notice, the middle mouse button no longer brings up the short cut folders. Checking the RHS tray, reveals that DF4.2 icon is missing (it was there before it stopped working).

In an attempt to get it running again, going to all apps & then running Direct Folders manually, only brings up the configuration, and does not restart the program.

My only solution is to restart the computer, and all is working again, usually for at least a day or more, until it happens again.