We have made sure the power source is always on. I have uninstalled and reinstalled Garmin Trainers. I have run X-Plane with high performance NVidia (default) selected. In looking through the logs in My Documents:
20/03/05 22:54:52.878 38604 - ] # rxpGtnSim64.dll version 2.5.22.2
20/03/05 22:54:52.878 38604 INFO ]
20/03/05 22:55:07.918 38604 ERROR] trainer not found
20/03/05 22:55:07.925 38604 INFO ] installed:
20/03/05 22:55:07.926 38604 INFO ] 6620 nav: C:\ProgramData\Garmin\Trainers\Databases\
20/03/05 22:54:50.114 38604 - ] # win.xpl version 2.5.22.2
20/03/05 22:54:50.114 38604 INFO ]
X-Plane 11 is installed on the D drive due to space limitations on C drive. This particular system has always had issues with GTN 750 (GNS 530 works fine). We have been through several version of the GTN 750 hoping an update would fix it. Checked Webroot Secure Anywhere quarantine, but was empty. Windows 10 1903, Intel i& 7700, 16 GB RAM, NVidia GTX 1060, 256 SSD boot and 1 TB HDD, X-Plane 11.41 (has been an issue from 11.2x). BTW: The other two simulators systems we have work flawless with GTN 750.