Fog Light Switch problems of the 2004 Mercury Marauder

2004 Mercury Marauder headlights occasionally stop functioning without warning. Running lights and fog lights continue working, no low/high beam headlights at all. Switch seems to be the issue, fuses are fine and no bulbs out. Recently had dealership replace driver side headlight, only change to vehicle before issue started. Possible issue continues in daytime, but headlights are not as needed in daylight. Due to necessary driving at night on high speed and unlit country roads, this is a serious issue.

While driving at night headlights stopped working fog lights stayed on,just got hard to see,had to hold the signal lever in the ''flash to pass'' to see the road. After work I pray that my headlights will come on. Now if I stop for a coffee and shut the car off for a few minutes the headlights will not come back on. I then need to leave the car running so they stay on.