HDMI issues

[s21]

I have tried my 2gb pine on 2 tv's with 4 different lengths of hdmi both work fine for 10-15 mins then the screen flashes black for a second and returns with a pink/blue/green hue (depending on the colour the screen should be), this can last between 5 and 10 mins then the screen goes black again and returns full colour, this happens every time and in a loop the entire time the pine is on, no matter what os I'm trying to boot.

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