hi I had an x10 that got stolen. wifi worked fine. it was replaced with xplay. wfi fine. upped to 2.3.4, problem. read it might be time/date conflict issue. then read my router's frimware had time/date inconsistency issues (mine insisted it was thur feb 19 2012, which 2/19/12 is a sunday, also real date was thur JAN 19 2012.
too long didn't read: try updating your router's firmware. worked for me