2018 Kia Optima -Light issues

auto h/light suddenly fail, but come back on after some length of time high beam switch worked but had to be held on, dash lights were on but couldn’t be dimmed. this has happened twice n the last month.

Original owner? If so, it is likely still under warranty, see your dealer. Even if you bought it used, it might still be under warranty. Read your owners manual to find out.