Recently I've started noticing that when I push unlock a second time to unlock all doors, sometimes 1 or 2 doors will not unlock. I think it was the passenger door at one point but today it happened to both rear doors. I tried pulling the handle on the inside for the rear doors but still couldn't open them. Locked and unlocked using the fob and they both unlocked fine. Any idea what's going on?

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Len
'04 X5 3.0i -- XTRONS 10.25 in HU, OEM tow hitch retrofit
'95 525iT- WIP