I have been using a 2nd monitor w my surface book for 6 months that is a 4k monitor. The resolution has been 3840x2160 during this time until I traveled recently. I returned to my home environment and the 2nd monitor won't go higher than 1920x1080 now. Has anyone else seen this happen and how do I get it back to the 3840x2160 resolution? I need this res to work in the software I use in my work.