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Abnormal battery consumption (4 days instead of 14+)

Hey.

I'm using Forerunner 965, FW 19.18, stock watch face.

For the last few weeks I've noticed that battery consumption changed from usual 14-18 days to totally abnormal 3-5 days.

Nothing changed: no FW updates lately, no settings changed, no apps or non-stock watch faces applied, no extremely long sport sessions or GPS tracking.

Any ideas what is going on? Anyone facing the same issue?
What do I do? Any tips on how to debug and find out what uses so much energy?