battery discharge faster

Interesting, worth testing... will see if I can test this with a bike ride or walk next time.

You can also try remove and add again ant+ sensors. I have already done reset and remove/add hrm-tri sensor, now monitoring. 

Also MoveIQ was disabled. 

The same for me.

I charged my device in the evening and restarted it. By the next morning, the battery had barely drained. However, after I did an activity the following night, the battery drained almost 10% overnight. I've tried restarting the device again to see if it stops the draining issue.

I’m getting 8-9% overnight now, used to be 0% a few updates before. But also I noticed recently I was getting notifications about reaching floors goal by driving in a car or one time I had an “elliptical workout” detected just out of the blue 

Mine done exactly the same. 12% overnight. Restarted the watch after activity yesterday and this morning was only 4% 

Kind of glad this is an obvious widespread problem, hopefully a fix will come. Anecdotally felt my watch has needed more frequent charging after the latest update, seems I am not alone.

Full charge Saturday morning and tonight, Tuesday, at 23%. Normally a full charge would last for a week now 77% drained in three days. Definitely a problem. 

For your information Fenix 8 / Enduro 3 / Fenix E just received 11.64 with Battery Drain and Naps fixes.

Garmin-Sierra, Garmin yes you can, all FRx55/x65 are waiting for your feedback for a fix too