I have a Surface Pro 2 and docking station. I have connected to the docking station an external Lenovo monitor Li2341t. I have had this setup for more than a year and has worked well. After updating to Windows 10 the system will not go into sleep mode while in the docking station. The work around I have found is as follows, leaving the Surface Pro 2 in the docking station, I disconnect it by sliding the two connectors away from the Surface Pro 2 (disconnecting it), I then using the power icon, select sleep mode. I wait about 5 minutes and connect the docking station again and it stays in sleep mode till I wake it. I have tried to locate an updated driver for the monitor but as of this writing no luck, any suggestions?