John,
Thanks for your quick response. I have attached my FSUIPC5.ini and FSUIPC6.ini files. The device in question is called "Saitek Pro Flight TPM System". I do see that there are multiple entries for this device-- not sure why. There are more in the FSUIPC6.ini file.
I disabled the power management for usb. I am using usb 3. Note, however, that my mixture and prop controls are on the same device as the throttle, i.e., the same usb connection, so I think this is probably not the cause of the problem. Furthermore, it failed multiple times (but not every time) after doing that in my testing today.
In testing this today, I found that when I go into FSUIPC, it does respond to the throttle control. To my surprise, after exiting FSUIPC, the throttle was then working. I will have to continue watching this, but if this is a fix, it is much better than having to restart P3D after replacing the INI file. I still can't figure out what causes this.
Thanks,
Wes
FSUIPC6.iniFSUIPC5.ini