Windows 10 Shared drive pops up an Explorer window every 20 minutes

[KhunMooCurt]

I shared two drives on my PC so I could play my media on my Raspberry Pi KODI box and one drive opens an Explorer window every 20 minutes on my PC.

One drive I shared was F: which is a partition on an internal SATA drive, it never opens a window.
The other was J: an external USB drive.

The external drive opens an Explorer window showing its contents every 20 minutes.
I first noticed it at 5:20 and at 6:20 but now I see it opens 3 times per hour.

Does anyone know why it's doing it and how I can stop it from opening a window every 20 minutes?

 

[Neemobeer]

I'd say either a program is opening it or possibly a scheduled task.

 

[KhunMooCurt]

I went through the Task Scheduler and I don't see anything running that could be doing it there.