hard to shut the tailgate with OEM tonneau cover

My tailget won't shut unless I lift the OEM tonneau a couple of inches.
It looks like the center of the tonneau sagged little bit.
Has anyone else had the same problem?
What's the fix?
My tonneau is a few years old.
Thx.

Sorry to hear of your troubles.

I have never experienced this issue and I do have the OEM Tonneau.

IF the tonneau was installed as new from your deler it would be covered by the 3/36 warranty...

If not, perhaps you can attach a small piece of 'L' shaped metal about 4 feet long to the underside to straighten it back out.

Good luck!