I have a 1998 Plymouth VOULGER THE SIGNAL LIGHTS WORKS GOOD
FOR ABOUT 1 WEEK . on 1998 Plymouth Voyager

AND GOES OUT FOR THREE OR FOUR DAYS,COMES BACK ON WHEN YOU LEASE EXPECT IT TO, AND REPEATS THE SAME ROUTINE OVER AND OVER AGAIN.THIS IS DANGEROUS BECAUSE I TRANPORT CHILDREN TO
SCHOOL AND BACK,NO ONE SEAM TO KNOW WHAT THE PROBLEM IS.
HELP NORA

2 answers
Other than putting parts on that you may not need, the only way to find the actual problem is to let a mechanic check it out when the lights are not working. Be careful and use hand signals if you have to!
Good luck with this!
you could have a bad flasher or signal switch but I agree with #1