Sudden unexplained acceleration

This situation with the car has only happened four times in the past year and a half but is a cause for concern. The car accelerates momentarily without stepping on the gas pedal. On one occasion I was slowing down while approaching a red light at approximately fifteen to twenty mph. I was about to apply the brakes when the car suddenly surged. I thought someone bumped me but there was no vehicle behind me. I had a couple of other close calls, once pulling into my garage and another time pulling into a parking space. Luckily each time allowed me enough time to slam on the brakes. I have read about other Honda owners with the same problem but ended in an accident. I realize with this situation only happening a few times makes it difficult to diagnose but any help would be appreciated. (before I crash)

Thanks,
Joe