Poor battery life in recent weeks

Up until 2-3 weeks ago, my Venu got great battery life--usually 4-6 days depending on how many workouts I did. But since then, the battery life has decreased by almost 50%, as I'm now only getting 2-3 days on a full charge. I'm not sure if this is a bug due to a recent update, or if it could be caused by a widget or watch face. I haven't changed any widgets or my watch face recently, though. Is anyone else having this problem?