Top & Bottom of design not cutting through

Newbie here, I have a Longer Ray5 20W, lately my designs have not been cutting through at the Top and Bottom but the rest cuts great. 3mm Basswood. Any suggestions? Thank you

Is this the same material/batch that was working for you before?

If you are at the edge of cut settings, you might need to add another pass. The beam is usually not square, and therefore the laser cuts better in one direction than the other.
You can turn objects by 45° or add another pass to be on the safe side.

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I will try that. thank you.

Yes, It was the same. Thank you

I would make sure the lens is clean.

I will check that. Thank you.