Hey,
got some tips from a german surface mvp.
Latest update from 31.01.2017 improves some mircast things.
January 30 release
The following updates are available for Windows 10 Surface Pro 3 devices:
| Intel Corporation – Display – 20.19.15.4568 | Intel(R) HD Graphics Family <br><br><ul><br><li>20.19.15.4568 improves Miracast and docked video performance.</li></ul><br><br>Intel(R) Display Audio<br><br><ul><br><li>6.16.00.3197 improves Miracast and docked video performance.</li></ul> |
|---|---|
| Microsoft - System Firmware update | Surface Pro UEFI<br><br><ul><br><li>3.11.2050.0 improves system performance for the latest Windows versions.</li></ul> |
Maybe give it another try?
Regards
flode