Sudden Battery Drain and difficult switch on.

I have experienced rapid battery drain the latest week too. I did not change anything myself. Software release problem like last year?

Hope not.. otherwise it will happen again.

I made 1 h training with HR band and when at home it was 4 % and in one minute completely dead.

Now seems to be as normal but I'm at home ... let's wait the next run on friday.

me too. 100% chargedtge Fenix 5X at start of a 1h run. Used gps navigation and HR band. At home in a short time a rapid total battery drain and the 5X switched off. Charging starts with 0% What caused it?

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WOW. It is exactly what happened to me.

I can say that now seems back to normal work. Today I had a 12 km run and the battery is still 87% after two days from full charge.

This time I did not use the HR band .... may be this is the difference.

I keep taking battery drain under control but , because it happened also to you, is seems a bug in the last FW possibly related to the calendar :)

I'm having the same issue. I'm not even tracking workouts with it and it's draining in less than a day. It also has difficulty starting up or has intermittent lock ups. Garmin, a response, please?

After that event my F5x is still with 50 % after 3 days with 1 running (1h) and 1 cycle ride (3 h).

Back to normal. Tomorrow I have a 1h run with HR band ... keep monitoring....

It happens to me too for the last 2 weeks, and in this past 2 weeks i started tou use calendar workouts, can it be related?

This might be related to battery drain even if it is not my case. The issue seems to be related to some internal OS process loop that drains the battery. Did you experience watch warming  ? 

Mine does not warm