Wire racks hard to slide

Hi, just got my Anova Precision Oven, and it’s going well, although I’m still learning.
A significant problem I have is that the wire racks are extremely difficult to slide back into the oven, especially when hot. Trying to do this quickly with the oven at 250deg C relicts in having to wriggle it and push, wriggle and push. Is it just me, or do others have the same problem, and is there a technique or hint (oil on the slides?) that can be used?
Thanks, Russell