I have a 21 year old Tag which I've never had serviced. It's never been in water and I've taken good care of it. Understandably, it takes more juice from the battery to run these days. I have to replace the battery at least 1X a year now. It's stopped working twice in the past several months. Is it worth spending the money to have it serviced? From what I've seen online I wouldn't send it back to Tag but most likely would use a local jewelry here in the Washington, DC area. Any advice would be appreciated.