Welcome to AF !!
Could be your muti function switch-MFS or your hazzard relay is bad.
Since its only doing it intermittantly Id lean toward the MFS.
Usualy a cleaning of the contact points works. Then installing new dielectric grease.
Ok, I didnt find the right one for you, so I just whipped a R&R for this.
1999-2005 Multi Function Switch-MFS
Hope that helps!