Well, i had the same problem with Fuji XT50. The solution is: first you set one of the auto options of ISO the low, and the high iso. Let's  say: Low ISO in 125 or 200, high ISO 1600 for a sunny day. Or higher in a dark day: 6400. Then you must go to set up menu (Symbol a wrench) choose button dial setting and the you set LOCK. Then in LOCK choose / SELECTED FUNCTION and then  / SELECTED. After that yoy go below, you choose FUNCTION SELECTION to block unwanted activations. In your case, you block ISO SETTINGS. Then  when you press the Q button you will see the iso mode DEACTIVATED. By the way, this happens  because you use shutter speed priority mode and the camera detects incorrect (usually very low speed. The problem is that the camera doesn't return to the previews selection and remains in high iso settings. Good Luck! (Advice: NEVER de-activate the LCD screen for reviewing pictures!)

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I do not think that rubbery looking seal on the side is actually a cable channel cover, but is instead a seal. If you compare the bottom of the X-T30 to the bottom of the X-T3, https://fujifilm-dsc.com/en-int/manual/x-t30/about_this_camera/parts/index.html vs https://fujifilm-dsc.com/en-int/manual/x-t3/about_this_camera/parts/index.html the X-T30 has the cable channel cover but the X-T3 does not. YMMV.

Hi guys. Firstly, I've put this in the general chat in case this issue isn't model specific. I've had my XT20 for nearly 6 years now, and thought I knew it inside out. However lately it's started doing something I haven't noticed before, and I'm unsure if it's a setting or possible fault. Usually when I'm out with the camera, I'll just leave the shutter set to ES & ME, only changing that to Mechanical only if I want to use ISO 100 (only for long water exposures really). But I've noticed occasionally the camera is switching from ES & ME to ES only without any input from me, and I can't work out why. I did have the camera acting a bit strange a month ago, so I carried out a factory reset. Now I'm unsure if this behaviour is down to a default setting, or the old fella is starting to get some sporadic software faults. Any help gratefully appreciated. Cheers Robin

Thank you for both your response and your welcome. I'm quite sure the cable channel cover can be removed or lifted, presumably so that a dc coupler can be used, but Fuji didn't make that easy to do.