Honda Accord

We have experienced a number of irritations with our 2006 Honda Accord since it was new, including windows coming down without touching the relevant switch, the car locking of its own accord when left overnight, the boot not opening using the hand piece, the dash lights coming on without reason, and the horn blowing when the door was opened and stopped when the door was closed. The car is still under extended warranty and documents show that the suspected electrical trouble was reported at the 4986 km service. Two separate Honda dealerships have tried to locate the problem to no avail and we realize that it is be hard to locate because it happens intermittently. Have you any idea as to the cause of the trouble and do you know of any other Honda owners who have experienced a similar problem?