Problem with pink and green screen on GT1 Ultimate

Opontios

Hi, beelink! It's been a few months that i bought the GT1 Ultimate, and I'm having a problem, that has turned up recently. On every 3-rd or 4-th boot the screen starts to go black, and then blinks with pink and after that with green color, and then goes black again, so the only way is to reboot. After reboot it boots normally, until the next 3-rd or 4-th boot. First I thought that it was a firmware issue, because it showed up after I flashed the Android 7 firmware. But now I've tried all the existing ROMs, starting from 701NO to 707NO. I also tried the alternative ROMs, that have been published. The problem is remaining. Please tell me if there could be a solution to this, or this is clearly a hardware issue, and what can be done? Your box is not of the cheapests, and that's why I chose it. Don't make me become very disapointed in your brand.

Opontios

Now, come on! Don't make me wait for a month! Does your company have support, or no?