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This happened to me too, the screen would randomly go black. Looking at the http://junkerhq.net/xrgb/index.php?title=Main_Page site, it suggests
“When using the Dreamcast with the OSSC, ensure that “480p in sampler” is set to “DTV 480p”
I did this and it resolved the issue. The default option for the 480p in sampler is auto and its probably flipping between different modes.