Software 15.05 vivoactive 5 issue

I'm using version 15.5, during the night my Garmin turned off, this morning when I didn't see that it was turning on I connected the device to the charging cable and it started to charge, it was completely discharged, it's the first time this has happened to me, yesterday I had 80% battery and now it drains overnight, it hadn't happened to me with other versions