You do want to check it out as soon as possible, but as genemish indicated, wait for a cold day.

This was a known issues also to E53, with driver's door not latching. I suspect water gets in the mechanical components and freezes/messes up electronics and other moving parts.

In my case it was eventually replaced and well lubricated with heavy lube, but the upcoming winter will indicate whether the problem is really gone.

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His : 2013 X5 3.5d Deep Sea Blue/Black/Aluminum with ALL packages, 20" 214"s, running boards, Adaptive Drive, Spare Tire, BMW Apps
On Order : 2016 X3 3.5 MSport Silver/Mocha with DHP, CW, Prem, Tech, DA, Lighting

Hers : 2015 328xi MSport Silver/Red

Prior:
2008 X5 4.8
2011 X5 3.5d
2010 335 xDrive
2013 335 xDrive