There is typically a warranty on repair work (the labor). The dealer provides this warranty, so terms can vary.It's doing it again on the new converter. I haven't extensively tested it but I felt it and my wife said it was doing it as well. Gonna do spark plugs first and then see if their latest program fixes it. Anyone have any luck getting them to replace one that had already had an issue and been replaced under warranty? There is an out of warranty "goodwill consideration" section on the service bulletin, hoping they come good on it or I will be a bit frustrated.
Honda parts also come with a warranty, and I think it's usually 12 months and there may be a mileage provision too.
I recommend taking it in as soon as you can, and seeing what they can do for you. Given that this was done so recently AND that it may be covered by the service or parts warranty AND your car is or was covered by a CPO warranty - you don't mention whether or not that has run out - I think there's an excellent chance they will cover any needed repair, even if your CPO warranty has run out. Give it a shot.