Aidinbaby

I love my journey but I've been having issues with it starting! I can be running errands and everything is fine then when I turn the key it just does a couple clicking sounds then nothing. I usually have to have someone come jump the car and that works most of the time. We have replaced the battery, altanator, ignition switch, and starter but it still happens! Any ideas of what is going on it doesn't show any error codes when read at the mechanic?