It's not clear to me how this can be a cable or monitor issue when it only happens in Xorg and it happens much more frequently when one particular app is running (see comment #4). Having said that, I will try to find a spare HDMI cable and test.
I am not using an adapter, I'm plugging an HDMI cable directly into an HDMI port both on the monitor and on the laptop.
It's not clear to me how this can be a cable or monitor issue when it only happens in Xorg and it happens much more frequently when one particular app is running (see comment #4). Having said that, I will try to find a spare HDMI cable and test.
I am not using an adapter, I'm plugging an HDMI cable directly into an HDMI port both on the monitor and on the laptop.