Turned the PS4 on tonight and the display was a total mess, with really off colour tone. Dark grey or black is magenta. Checked the other inputs and they were fine so suspected the PS4 HDMI port. No amount of input switching and power cycling cured it. Did a bit more to isolate the problem and it turns out that on the PS4 input I've got "video conversion" enabled on the amp. Turning it off fixes the issue! It feels like a fault to me, perhaps one that could get wose - this isn't a setting that I've recently turned on. Any thoughts? It's within a Richer Sounds 5 year warranty, so I could return it, but I do like the amp, tried a few out and the sound quality is fantastic.