Have this issue as well, also figured out the lock workaround, but FYI: mine is also because is also because of display sleep. But I get the black screen whether in my home LAN (where the computer i'm remoting into is - my laptop, which lives in the closet) or remoting into it from my office. If i'm home, i just switch my mouse over and back because, unlike teamviewers cursor, the actual local cursor will wake it (duh, obviously). But yea if i'm out of home i have to do the lock screen trick and its supppper annoying.
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