I have experienced something similar in the past and it made me very puzzled until I figured out what was wrong in that situation. Make sure the clock on both systems are synchronized to an NTP server. IIRC SSH just threw a fit exactly like this without logging why, and it turned out to be a security feature where the ssh server suspected the communication to be intercepted by man-in-the-middle due to clocks not being synchronized. And if logging in physically to the system, apt refused to work as-well until clock was synced. Could be worth to check next time... As for dhcp and systemd. Check if systemd-resolved.service is messing something up for you, maybe try to disable it?

please look herer , maybe some post later and newer Some OPTEE Loader work 1min , one 30min , in the past same game was with trustOS (bootloader) there are two or three diffirrent

Actually not really strange but a measure for spam prevention.

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Hi, does this version of the S805 have HDMI and Wi-Fi? Could you explain more about this backup? Thank you.