Lexusfreak

I leave my dome light on "door" mode all the time & as I understand it (I have read the owners manual several times) the dome light should come on when any of the doors are open (it should also come on as an illuminated entry system when the door(s) are unlooked with the remote entry) but it only comes on maybe 10 - 20% of the time. I fiddle & jiggle the swich itself & the light will come on. Sound like a I should take it to the dealer to get the switch / electrical connections looked at? Any thoughts or advice anyone?