My bike was a left over from 2014..... Is this the ecu problem I have read about? Has anyone heard about a recall in the states yet?
In my opinion, your bike is a likely candidate for the ECU swap, based on your description.(I have had my '14 swapped). If so it will be a warranty process. There probably will not be a "recall" because it looks like there is only a relatively small number of bikes effected and they are seemingly not from a single production run.
You should closely read the Suzuki USA web site. They flat out say that any request must be initiated via postal mail (on paper / not email). I would recommend that you do your part to make it easy for them by including your VIN, Date of Purchase, Dealer info and phone # and especially your phone number and address.
In that letter, state your case and briefly describe any safety issues that concerns you. Be nice, the folks reading your letter are nice and most are bike riders too. In my case, I got a phone call from one of the customer service folks and the replacement went smoothly and quickly.
I have read in other threads that some folks got a replacement and found no difference afterwards. Likely, they didn't have a ECU problem. I know that in the beginning, before I knew there might be a ECU issue, I had my dealer sync the throttle bodies. That made a big improvement in the way it ran even though the stalling remained. We should remember that this was, for all intents, a first issue bike and there must have been a strong incentive to pass all the emission tests of all the various agencies, worldwide. So the fueling was as skinny as possible. I am happy to say that with the throttle body sync and ECU, my bike now runs as smooth and cleanly as I ever expected.