Hi All,
I have been fighting this issue for months. I have tried all the suggestions on this thread but none have worked. I also stopped by my local Microsoft store and had a tech look at it without success.
So, to finally get my Surface Pro3 back to working I purchased a 3rd party Bluetooth Touch Cover. It cost me $64 USA and works like a charm. The glide pad works like OEM and even has pinch and zoom along with a few other features.
An additional plus is the backlighting adjusts to 7 different colors. It also works with Surface Pro 3 and newer.
The only draw backs I have found so far are:
I have to charge it separately but doing that increases the Surfaces battery life.
The other issue "very minor" is the magnet that attaches the Type Cover to the Surface is not as strong as OEM.
All said and done. I prefer the OEM Type Cover but, the 3rd party comes in as a close second and I now have a fully functional Surface Pro again.