Sunvisor

Did a search but can't find my problem.My driver side sunvisor keeps coming loose on my 2015 Frontier S. I had it fixed under warranty but now it is working its way loose again and lopping down.There is about an inch of play in it .Anybody know how you fix it? Don't see any way of getting into it.The plastic covering the control arm looks pretty brittle and afraid I might break it if I try prying around on it.