I have an HDMI switch that starts acting up if the power cable gets loose. Why does the power cable get loose? No idea, but it’s also a cheap nobrand switch. This probably isn’t your issue, but try pushing the barrel connector in more or try a power supply that supports a higher current (same output voltage). I only mention it because I only managed to “fix” my switch by noticing it was just a mm out of the jack.
I have an HDMI switch that starts acting up if the power cable gets loose. Why does the power cable get loose? No idea, but it’s also a cheap nobrand switch. This probably isn’t your issue, but try pushing the barrel connector in more or try a power supply that supports a higher current (same output voltage). I only mention it because I only managed to “fix” my switch by noticing it was just a mm out of the jack.