the spurious F95ZONE_UNAVAILABLE errors should be fixed now. while implementing the fixes i mentioned here
i made a mistake, so that all f95zone "generic error" pages were considered as F95ZONE_UNAVAILABLE. when a thread is missing, it also uses the generic f95zone error page, with text like "The requested thread could not be found." and "You do not have permission to view this page or perform this action."
i have now changed it so that when a f95zone "generic error" page is detected, it grabs the error message that f95zone gave, if its one for a missing thread it works as usual giving the option to convert to a custom game, otherwise it will show an error like "F95ZONE_ERROR: <the message from f95zone>", eg "F95ZONE_ERROR: We are migrating something, be back in 5 minutes."
all threads still with F95ZONE_UNAVAILABLE will be correctly recognized as missing threads within the next 15 minutes as cache is cleared.