I and two of my colleagues recently got latest Surface Pro 3 tablets (512 GB model, i7) and we all have same problem with the VPN. VPN works just fine for one or two minutes, but then it just stops working / connection becomes Limited. I have same problem with our company's VPN-connection (L2TP) and also with overplay.com's VPN (PPTP) as well. Problem occurs both with WIFI (Surface's Marvell AVASTAR) and fixed ethernet (Surface Ethernet Adapter). I can typically disconnect/reconnect few times, but then this stops working as well. Only Microsoft's own firewall is installed, and allowing all traffic did not help either. I had no problems with previous Sony Vaio, also running Windows 8. Also, none of my 50+ other colleagues with VPN has no problems (Win/Mac-users). Any suggestions?