Have you got just the one fob or have you another to try? I've got 3 with my XC70 and one is now showing as needing new battery when inserted into the dashboard.
An increasingly common problem now is localised interference - do you have same issues when parked away from home?
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2008 XC70 3.2 SE Lux with LPG conversion - current
2005 XC70 D5 SE Lux - sold
2004 XC70 D5 SE Lux - written off by another XC70
2001 V70 D5 - sold
2000 V70 Classic 2.4 - sold
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