If the key doesn't work after a drive, I suspect you may need the dealer to reprogram the keys. If that's the case you can secure your X the old fasion way. . .Lock the doors with the key, until you get back from holiday.

__________________
0O(llll)(llll)O0
2007 Suzuki Vinson 500 4X4
2007 Toro 6.5hp
2006 BMW X5 4.4 ltr (his)
2001 BMW X5 4.4 ltr (hers)
1994 Honda XR650L
1984 Honda XR80

"Beer is proof that God loves us and wants us to be happy."
Benjamin Franklin