My Surface Pro 3 w/ Win 8.1 is only 2 weeks old and has had one Windows update so far. I don't have any unusual apps or files, programs, etc. I've used up about 40% of my 256 GB but also have a 64 GB Micro installed. Lately, regardless of battery strength, it can sometimes take more than 2 minutes to startup after I input my password. The circle just goes round and round - then eventually goes to the Startup screen. Sometimes it takes just as long to shutdown. I also get a long pause occasionally when opening Windows Explorer. Any ideas where to start looking?