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External Monitor for HP laptop keeps locking up

HP Recommended
HP Pavilion x360 Convertible 14m
Microsoft Windows 10 (64-bit)

In the last few months, my laptop and my external LG monitor momentarily go black.  They both come back on but the LG monitor is locked.  I can move the mouse around the laptop screen but the image on the LG is locked.  Then they both flicker and come live again.  Sometimes, the monitor is just locked and I have to start the computer again.   I have cleared the caches, temp files, memory, cleaned the disk,   updated the device drivers, checked for errors in memory, disconnected and re-connected the monitor.  It's getting worse and I don't know what to do.  I can't go more than a few minutes and the screens flicker and the LG is locked and I have to look at the laptop screen to move around.  Any suggestions?  


I've done everything in listed in this blog:

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