My seat jiggles forwards and backwards about a cm on the right side of the rail.
It's worse when sitting in it. And I may be a fat áss, but Nissan blows at making seat rails. Had 3 on my Maxima before it was solid and my dad's brand new Maxima will have a replacement soon.
I hope you have some sort of warranty, or lube up, the seat base is like $3000