Ok... I have news (WEIRD news).
I'm using the Dell image without issues.
The only thing that I've done is to lower it so that it's at 15cm from the desktop and tilt it so that the screen is perpendicular to my eyes. Before I had it much higher without tilt.
If you have any explanation to this let me know. I've used it for more than one wk and 5h a day and no issues so far.
PD: I've also updated the amd linux drivers ( Kernel -> 4.19.0-9-amd64, ROCM-SMI version: 1.4.1 | Kernel version: 5.6.0)