Help T'shooting Cause of Warped Print

[lothian]

Longer LK4 Pro (amzn.com/B08JPRL5BJ)
HATCHBOX PLA (amzn.com/B00J0ECR5I)
Fusion360 and Cura v4.11


Each time I print the object below--70 x 32 x 8mm block with a few channels--the thing comes out warped as shown in the images. I've generated plenty of objects with this printer, and I've never experienced this problem before.

I lowered/raised printer's plate temp; I increased/decreased Quality/Infill settings in Cura; I moved the print location on the plate--same result every time. I'm stumped.

This is the extent of my troubleshooting knowledge, and now I reach out out for suggestions leading to a solution.