Surface Pro 4 type cover suddenly not working.

Running for about a week now and not a problem anymore its like it was never gone. I had 1 loss of keyboard when my power hit power saving % but came back after a disconnect and full charge, but I only plugged keyboard in when I seen auto rotate was working.

The above suggestion isn't hard and full recoverable so no loss trying.

Disconnect the keyboard through whole process.

First hit windows and goto the settings cog and windows update and security, click the pause for 7 days button and then go into advanced and turn off updates for other microsoft products and go back and into view update history and click the uninstall updates. Select each and uninstall them all. 

Right click (touch and hold and release) the windows start button and select device manager, expand the firmware section and right click each firmware (except surface touch firmware) and uninstall device for the 5 of them and if theres a tick box tick it on any that offers it.

Then expand the keyboards section and remove and thats there (yes mine had 3 and sometimes 4 but only have 1 usb keyboard and it still works) or do as I did and right click them and update driver to something that 100% you haven't got to crash the driver so no conflicts (but if you do not wish to do this just uninstall them they will update back) then do same with mouse section.

Scroll down to sensors and uninstall the hid sensor collection v2

Scroll down to system devices and expand it and move down the list to surface integration service device and right click it and uninstall it.

Restart your surface ( I did and 2 button reset but whether it matters I dunno) once booted back up go back to your window update and release the pause and search for updates install everything offer and restart, once booted back up again check your auto rotate and if it is back working then plug the type cover back in and it should be back if it doesnt rotate don't plug the type cover in just leave the surface on charge and check it periodically for rotation.

Hope it helps as thats exactly what I performed to get up and running again. ✌

Sounds mighty complicated. How long has yours been running 'fixed' for?

In keyboards I only have one HID driver and one Soft cover driver. Are you running a wireless mouse via the USB port or something? as that shows as another HID keyboard driver.

For me, despite MS updates saying no updates, a third party software driver updater has been updating my drivers over the past week or so, still no change however with the issue. At present after the first boot up for the day I am disconnecting the keyboard from the Surface, counting to 10 slowly and reconnecting, and I am good for the day usually.

If it helps I also purposely installed wrong drivers on the 3 hid keyboards in keyboards and the same with the mouse one. Forgot I did that as wanted to rule out conflicts, but they still same as I left them.

You could try disconnecting keyboard 

Uninstalling all available windows updates that are removable

Open device manager

Uninstall (tick where available) all firmware's bar surface touch

Update the hid 3 keyboard drivers and 1 mouse driver to something wrong

Uninstall the surface integration service device from under the system devices tab

And power button and volume up for the max length (keep it held in even in uefi) let go and power on when no more restarts happen

Goto windows update take whatever it has available

Then leave it plugged into power go do something then come back lift it and tilt if the orientation comes back plug keyboard in if it doesn't rotate same again, leave it a while just don't plug the keyboard in till the sensors get a touch of the god juice cause till that array of sensors comes back keyboard won't work (from the randomness of my experience anyway) ✌

Try this 👆 worked on mine and nothing at all worked on mine for weeks, uninstalled all firmwares except the touch one "updated" the 3 hid keyboards& 1 mouse drivers that are not the type covers remove the surface integration service device restart and update mines still working without issue and still running 3 samsung drivers over the hid keyboards and 1 on the mouse. Good luck

normal windows update process - 

Microsoft Windows Update

1. Open the Control Panel.
2. If using Small icons view, click on the Windows Update option. If using the Category view, click on the System and Security option, then click on the Windows Update option.
3. Windows Update will check for any available updates for your computer.

Well I'm someone else that it has happened to. Switched off on Friday, switched back on in Monday and no Type Cover.  MS support tried everything, but I wouldn't let them do a factory reset. Definitely the Surface 4 and not the type cover as I tried another machine and the type cover worked. Going to try a Bluetooth keyboard and mouse I think. Anyone got any suggestions? Definitely the last MShardware I shal buy.