My 2010 D4 had same issue and bonnet switch replaced some time ago and all good again.i.e initially intermittent and then finally hard on and bypass needed until fixed.
Alarm went off recently, I unlocked to stop it and then it would not lock again. Says the right rear passenger door is open. It was closed, but opened and closed and its all good. It was the second recent one, the first just went away. I am thinking the door sensors might be going the same way as the bonnet sensor. Has anyone experienced this had them changed. Its all quiet for the moment.
Regards
Gerry


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