Hi there!
I have problem with computer (DELL Optiplex 7020) with freshly installed Windows 8.1 Pro. After resume from sleep, network drives are unacessible, if I try to restart LanmanWorkstation service (net stop LanmanWorkstation && net start LanmanWorkstation) service state is stopping... until computer is resterted. I was waiting for two hours and the I tried to kill related proces, but wit no luck. After computer restart, everything is working fine until computer fall to sleep - and then get resumed...
All Microsoft Update patches are installed, all drivers are freshly downloaded from DELL's website. No antivirus or security, tunning application is involved. Just MS Office and some other applications for photo editing. Computer is also connected to one iSCSI target, but I believe that is not related to the problem.
Jan