Tracking down Random Blank Screen HDMI issues

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Joined
30 Jul 2007
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Win 11/AM5/4090
Yamaha RX-A6A/Epsom LS-12000b, 10M powered HDMI cable.
3480x2096 x 120Hz by 10Bit HDR

Every now and then i get a blank screen or Obvious RGB discoloration when I switch on equipment.
So i assume its a 'negotiation' issue.
Occasionally the screen goes blank and comes back during usage..

I was guessing a HDMI cabling/length issue but power cycling AV amp reliably sorts out the problem for another couple of weeks.
I dont have enough spare equipment for A/B testing.
any experience on what these symptoms do or dont point to?
 
Thanks ive since found some evidence (AV forums posts) that the amp family struggles with 120hz (at least on XBOX) so will try 60hz for a while and separately your suggestion of a separate USB power.
Currently its powered at the projector end with a usb-a dongle which goes into the dedicated port in the projector.
Would any phone charger suffice as a usb power source.
 
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