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Got a different monitor to try, or/and a different cable? (It could be the monitor on the way out.. so try wiggling/shaking gently as well).
Tried wiggling the cable to see if anything on the screen flickers?
Ive changed the cable today and now the waiting game again to see if it happens again. If it does happens, I'l just try turning monitor off and on and see if that fixes it, If so I'll be returning the monitor as Ive only had it since xmas
Is Christmas when this issue started? hmmm