Excessive time gain...Thoughts welcomed

[WS9D]

So my 1.5 year old 116710 is now gaining approx. 15 seconds every 24 hours. This has been confirmed via numerous syncs to WWV and time.gov. Kello is showing +13. It has gained one minute over the last 4 days. I've tried the old let the power reserve run down and give it a good 40 winds with no luck. Should I just live with it or send it in? What would you do if this was you? I would't miss it (too much, but some) if it was away as bluesy, 16710, or BBBlue would just see more wrist time.