anyone experience tamron 28-75mm Zoom Sticking?

looking at someone selling one of these lenses, and they claim that the lens works fine, however on occasion the lens barrel sticks when zooming? they of course don't know what the problem is

anyone with any experience with this?

I'm thinking if i can get it cheap enough, I can deal with a sticky barrel every now and again, i just don't want it to be the start of a much bigger problem

Had my 28-75 for like 3 yrs now, never had any issues like that.