Update: The dock was replaced for sound issues (this is dock #3), however, the video issue still remains. I still need a solution to this screen blanking issue.
I am having a problem with a dual monitor setup.  The monitors periodically go blank for 3~4 seconds, just one at a time, the other stays on uninterrupted.  The data continues uninterrupted, (e.g. I can keep typing and it does not miss anything).  System: The monitors are older units, however they have never had this problem before.  The prior setup was a Microsoft Surface Pro and dock which worked perfectly. I have been chasing this issue since purchasing the new Dell computer.  So far, I have tried the following: It seems that nothing I have done has any effect on the blanking issue.   Any ideas on how to solve this?
Dell Vostro 7620 Computer Dell Dock Dell Monitors Screen Keeps Going Blank