sometimes when I start up my 2004 Ls I’m asked to service parking brake. It works fine without hiccups. What I’ve noticed is that after running a bit and it is warm if I shut the engine and turn it back on the prompt doesn’t show up until after letting it sit over night. Could it be that the battery is draining and it’s not getting correct voltage after sitting overnight and then it charges ans doesn’t have time to drain through the day. Also my backup sensors have been acting up recently too not recognizing objects behind me unless I go from R to D back to R while an object is close behind then it’ll beep at me for a while and stop again.