I recently purchased a Vivoactive 4S. For the first week and a half, the battery was doing great, lasting about 3 or 4 days. Then I got the Software update to 6.4. Since then my battery has been draining dramatically faster. Charged to 100 % last night, it was only 66% 6 hrs later.. The battery won't even last a whole day. I am not running the GPS. I do have the heart rate monitor on but it was on before the update as well and did not seem to be a problem. I am running a watch face I got in the Connect IQ store, but, again, I was running that before. Is there anything I can do to resolve this, or is it time to return the watch? I have had it less than two weeks. Very disappointed.