Ignition problems of the 2008 Honda Accord

I have a Honda Accord lx 2008 sedan which I bought 2 years ago. Ever since I bought this each year without fail I have experienced intermittent lack of power during acceleration which has happened while driving on the highway, each time it has lasted any where from 20 to 45mins ,there no engine check light on or any indication light of a malfunction. I reported to the dealership left the car with them over night I was told that they ran the automated computer test and nothing was found to be wrong with the car , the second time it occurred I called Honda USA and reported the same incident , I was contacted by Honda told to take to a dealership , I left the car over a week and was told the automated test showed nothing and they could not duplicate the problem . This same thing occurred again this year and I contacted Honda dealership , I produced a bulletin from Honda web site describing exactly the problem my car has been experiencing , I contacted Honda took it the dealership I was told that my car VIN # range wasn't covered in those affected since my car had a more recent soft ware up date. And that they will have to duplicate the problem, as per Honda request I left the car and I was told there was nothing they could do, even though the problem had persisted and has being recurring I was told to bring it in when it occurs again but its had happened three times already I have a. My frustration stems from the fact that Honda USA claims that my car has an up dated soft ware and even the over ride could not be possible , but the problem detailed in the Honda bulletin memo describes what's happening to my car. The bulletin states thus : some 2008 Accord l4 vehicles may experience an intermittent lack of power due to interference or noise on the knock sensor signal circuit . Interference or noise on the circuit can cause the pcm to retard the ignition timing , causing a decrease in engine power usually during acceleration.