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Have you tried replacing your HDMI cable? That might causing the Docking station issue
I think you're onto something. I have two HP cube shaped docks on my closet now waiting on a return box. The third is holding, but only because there's also a reg key for windows that will lose compression on the HDMI and make it not resynch so often.
I still get the blinks, but they're daily instead of hourly. I can dig it out if it's valuable and the cables are good.
I'm also using a steetek/PWay/etc 2x2 HDMI KVM switcher downstream of that dock, so I can switch between two contract desktops for my k,v and m as the day cleaves to night.
I have had the problem with a variety of cables. I think its a software issue. Wiggeling the cable does not cause any issues. The screen never looses signal its just briefly black.
But I guess it can't hurt to try more cables.
This is why I switched to display port. It seems to work so much better. Also see if your dock is overheating. I've had that happen in the past and caused flickering issues.
I tried displayport too. My main dell 4k monitor had some issues with it. I updated the firmware maybe it works better now.
I have two monitors. Depending on where I plug in, it uses MST or no mst.
Also good tip about the overheating but the dock has a fan and remains quite cool during operation.
It's difficult to debug since sometimes it works for two days and on other days it hap'ens constantly.