If topping the fluid up fixes it bear in mind your brake pads could be getting low or could just be low on fluid for some other reason .
Take car for a good run 30 mins or so and see if state of charge gets any better
I had similar on mine , my auxillary heater kept knocking its self off in a morning , my car has had a new Bosch battery over orginal spec , but in the drop down list bosch batterys was not in there , i was getting the quiecent current stage 1 2 3 codes , so battery regulation stopped the aux heater from working .my S O C was 60 % or around that
See on the coding at the end the 105A im assuming that means 105 amp hour because thats what was on the orginal battery , so i changed that to 115A ....press do it /ok .
It changes the very long code slightly by 1 or 2 figures
The state of charge then went up to 90 % after a 10 min drive around it went up to 100 % , my aux heater as worked a treat since