might be an issue with the battery then, try out the battery calibration once and if it doesnt work hit up apple

no worries, do you keep it plugged in all the time?, also make sure to check what battery health % mac os tells you: go to settings>battery>click on the i icon in battery health bar and tell us what maximum capacity % is, these third party apps can be sometimes inaccurate

ok,try calibrating the battery, this might just be battery miscalibration:

1.Charge the battery fully, and leave on charge for another 2 hours.
2.Change all the Battery Settings and the Desktop Screen settings to consume maximum energy
3.Let the laptop battery run down completely. This may take several hours.
4.Leave the laptop off and unplugged overnight to make sure the battery is fully drained.
5.Charge the laptop back up and reset the Battery and Desktop settings to normal values.

Do you use Aldente?