Don't know why you are getting down voted, I have (3) 3k displays (ASUS PB278Q) and I have frequent problems getting them to come back up after reboots or sleep

Don't know why you are getting down voted, I have (3) 3k displays (ASUS PB278Q) and I have frequent problems getting them to come back up after reboots or sleep. I've tried 5 different brands of displayport cables, a MST HUB, drivers, mixed config (DVI, Onboard Intel, ect...). The AMD driver will report that there is not enough bandwidth, the only thing I can do to get them to come back up is unplug and replug the disport cable. Research online shows this is a common problem with Hires displays.