evpad HDMI

Hi guys. i recently bought an evpad 3s which was working fine for the last 2 months. however the screen goes black intermittently saying HDMI plug in and out automatically. i tried changing all HDMI 2.0 cables that i have and putting it all into HDMI ports that i have on my TV. but still the same. can anyone help me here? running out of ideas what to do. thanks alot in advance.

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