Definitely take it in. I had something similar happen to my walnut Hailey, my SA offered to replace it but Coach was sold out at the time, so he offered repair through Coach or I could go through a local cobbler to have it fixed and get reimbursed by Coach. I chose the local cobbler, they botched the job, but by then JAX had replenished so I got a new Hailey and haven't had any problems with her. That stitch would have driven me crazy because no way it wasn't going to get worse.