I just installed the latest software application update v7.161 on my tomtom One XL via TomTom Home v2 Problem is I am using a 3rd party 4gb SD card and whenever I turn the TomTom off and try to turn it back on again it acts as if its dead. No power and will not turn on anymore. Strange thing is after I have removed and reinsert the sd card the TomTom then will turn on and work perfectly. But only after the memory card has been removed and reinserted. Anybody else had this happen to there tomtom? I never had this problem before the last application update was installed.