It's not the phone connection via the app is it?

https://fujifilm-dsc.com/en/manual/x-t4/menu_setup/connection_setting/index.html The PC Autosave section may have a destination pc set up in it. Alternatively, you can try deleting various wireless connections to get it to stop trying to connect.

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Hello all recently and for no apparent reason, after shooting RAF RAW or JPEG the XT4 is (without my permission) "transferring to PC", so I have to turn the camera OFF to stop it. Been scouring through the menu for hours now to no avail. Havent found a solution anywhere. Can you help. Thx

To go along with this, unless the camera is in full manual mode, the “auto” algorithms will notice sensor changes caused by rotating the lens’ aperture ring and make adjustments to other settings, most likely adjustments to the shutter speed. The f-stop is changing, but not being recorded. Try setting the iso and shutter speed manually, you will have to remember what you put the f-stop setting to though. p.s. Welcome to the forum.