I have a company supplied ZBook 15 and its companion ThunderBolt 3 based docking station. No problems with the computer, lots problems with the docking station. The latest is a continual, periodic blinking to black on one of the 2 monitors connected. The only cure is to reboot the system. The problem occurs after the system goes into sleep mode overnight. I use the system primarily in the desktop mode, and seldom disconnect it from the docking station. Basically, I have to reboot the system every morning!
I have already updated every driver in the system with the HP SoftPaq utility, verified Windows V7 and all of its associated files are up to date, replacing and swapped cables & monitors, etc.
The two monitors I am using support DVI or HDMI interfaces, not the latest Display Port? I am using generic adapter interface cables from Amazon Basics.