Just had this exact thing happen to me at floor 94/100. I couldnt get anything to work except left and right click on mouse, but couldnt move the camera or invite. Would also like to know if anyone found a way to fix it.

So i might be worng but you do my current observations it incurs under rapid device changes within windows or device changing game isn't currently focused my current advice is play with full batteries if you're going to be doing something long like a high level free dungeon

I experience a couple of input loss almost back to back while farming food dungeons. Mouse and keyboard being disable too is painful. I also agree that it might seems to be linked to my ps4 pad diconnecting and being unable to reconnect itself.

I don't know if it's broken or not but it's giving me some trouble. I switched to my steam controler since and i haven't had a single deconnection since.

I also have had this problem a few times.
Controller disconnects and I can only use mouse.

If you use your mouse to change the video settings from Borderless Windowed/Full screen to Wndowed, sometimes the keyboard comes back allowing you to Gency out and/or save your game.

I use my wireless series X controller in wired mode. It happened to me like two or three times in 100h of gameplay.

All three times I managed to fix it by simply unplugging and reconnecting the gamepad back.