E320 Electronic boot release delay
 

I am a very strange problem... My E320 has a electronic boot release switch and sometimes when I press it or using the remote key to open the boot when the car is locked, it takes 10 seconds or so before opening.

Once it open, you cannot close it, again, you need to wait for 20-30 seconds before you can close it.

Everything else works like magic but this is getting more annoying....

Many thanks in advance...