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6.40 rollout dramatically decreasing battery life

Release 6.40  was automatically installed on my device last week. Since then I've seen the battery life on my 6 month old device go from lasting 5-7 days with moderate usage of gps (2* 7-10km runs per week) to now lasting less than two days even with no gps use. For example yesterday the battery drained to 44% after a full charge the night before.

The only other thing I did on the day the battery life started decreasing was a 20min swim. Could that have affected it? I've noticed small cracks in the HR monitor (see my previous post) and wondered if that could also be it.

Anyone else experiencing issues?