No display shortly after boot

Hi all, I just got a Rock 4 SE, I have installed the debian OS, the device works great for up to 5 minutes then stops sending signal to the display. The cable and monitor are working perfectly with other devices any ideas on what the issue is are greatly appreciated, am under some time pressure to complete this Thanks!

Logs ?
cat /var/log/messages
cat /var/log/xorg
cat /var/log/kern.log
once it goes off try checking logs in live with:
journalctl -xe