Hi psrchaks

first, what version of db, and what os.
second, x1 and x2 are diff or copy of x1 into x2?
third, check bacup times in x2 (where you get the data from) and look at when x2 and x1 where down.
and last but not least, look at your alert log. if you have nothing there it is strange, but i'll go for network problem. look at your network error log.