Dash lights turns off after a few time

Hello guys, hope y'all finding good today.
My 2009 VNM is being doing this since a couple days ago, when i turn the lights on, all the switches symbols lights turns on as normal, but after a few minutes it's turns off and it doesn't turn on again even if i switch lights off and on again, the display is fine, it's only the lights on the switches at the right of the dashboard, the aribags, 5th wheel, etc.
Any idea what i could be?
Thank you !!!