[XT-3 (NEW) locks up / freezes randomly]

Totally agree. But I'm just not 100% sure if it's the problem with the firmware version 4.00, as I first experienced this problem with the older firmware version, then I upgraded to version 4.00 the problem still existed. So to me it feels the issue is with the XT3 model, at least for my case using flash light. 

[XT-3 (NEW) locks up / freezes randomly]

I actually shipped my camera to Fuji Service Center in NJ, after several calls they told me I will need my shutter to be replaced (which will cost me $270 as it's out of warranty). I'm really not quite sure if it's the shutter issue as for my case the camera works fine without the flashlight, and I actually tried my friend's Fuji XT3 camera using the same Godox flash settings and his camera experienced the same lock up issue as well. I ended up not proceeding with the fix. But this lock up issue remains unsolved. 

[XT-3 (NEW) locks up / freezes randomly]

I'm having the same issue when I'm using the camera with a Godox flash light! Almost every 10-20 photos the issue occurs and the camera freezes completely, the indicator lamp turns into orange. And same here I have to literally take the battery out to resume the camera.  Look for a solution too.