Battery Life of iPhone X

I plugged my iPhone X in at night with maybe 75 to 85% charge.

I get up & go out walking, when I get home I look at it and the charge is 1%. This has been

two days in a row. But have had battery drain prior to this during the day when I haven't even used my phone. Apparently many other people are experiencing a similar issue. I don't think it's due to the brightness settings. I haven't changed that ever. Perhaps it has to do with the new updates. Remember the noise cancelling on phone calls. Cancelled all the noise including the caller. Hope there is a fix.