Hello all. I'm hoping someone on here can help me out. I have an sp4 and the type cover stopped working out of the blue the other day. I have an sp3 that I use for work so I tried that type cover on my sp4 and it worked fine. Then I tried my sp4 type cover on my work sp3 and it worked fine. I have tried everything from cleaning the contacts on the keyboard and sp4 to doing a complete restore on the sp4. Does anyone out there have any ideas?