This last few days something weird has started happening with my game in Windows 10 and it is driving me nuts. For some reason, once I start the game, my pc seems to be polling my USB ports twice a minute (regular) and this is causing my game to stutter as it does so (twice for each polling incidence). I have flight panels connected to he PC and the multi-panel flashes on for a few seconds at the same time as the game stutters. This has never happened before this past couple of days. It happens with both Horizons and Odyssey, both a stand-alone installation and a Steam installation. The flight panels do not flash with no game running - the flashing / polling / stuttering is not happening with other games or X-Plane11, Prepar3d or MSFS 2020.
This also produces a really strange effect on my desktop - all the icons with shortcut arrows have the shortcut bit change to either an "X" or a tick (see image below) - Desktop refresh (F5) after shutting the game restores them to normal. This does not occur when the polling / flashing situation has not occurred.
This is driving me nuts, I can't see anything strange in the task manager and full system scans with malwarebytes and windows antivirus find no issues.
Please could some kind PC guru have a think about this issue and maybe give me a hint or suggest a way to investigate.
I have posted a video sitting outside a station to illustrate the stuttering and the periodicity of that.
Thanks for any ideas / suggestions.

Source: https://youtu.be/XHdaEmMYMyw
This also produces a really strange effect on my desktop - all the icons with shortcut arrows have the shortcut bit change to either an "X" or a tick (see image below) - Desktop refresh (F5) after shutting the game restores them to normal. This does not occur when the polling / flashing situation has not occurred.
This is driving me nuts, I can't see anything strange in the task manager and full system scans with malwarebytes and windows antivirus find no issues.
Please could some kind PC guru have a think about this issue and maybe give me a hint or suggest a way to investigate.
I have posted a video sitting outside a station to illustrate the stuttering and the periodicity of that.
Thanks for any ideas / suggestions.
