The only code I had was 4A62 or 4A63 or something like that related to DDE EWS alignment;
but I didn't want to believe it had anything to do with it,
because it refused to even crank,
and then suddenly it would crank and start like everything was Aok;
as time went on I didn't trust it to start;
I almost gave up and was going to take it to BMW and leave my wallet with them while they would have probably replaced DDE EWS, keys , who knows leaving me broke;
I even had problems resyncing or realigning;
In my case the problems started after I took my X5 to local mechanic who read my codes with a small hand held reader-
An error occurred- I didn't pay it no mind at the time- but my problems started after that-
It was confusing as I thought if EWS wasn't in sync,,then it should never start and should still crank-
But that's not what happened-
completely random no crank-
I had to align at least twice-
Then no problems since , and it's been over a year now all good.
Bear in mind mine is a diesel, but I guess BMW use a similar system, considering my e53 was built at South Carolina with every other e53.

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X5 E70 3.0d M-Sport , 2010 Titan Silver , ZF 6HP28, 320hp.

X5 E53 3.0d Sport, 2006 LeMans Blue, ZF 6HP26, diesel .