Weird Horizontal Pattern on Recent Prints

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I just noticed some horizontal pattern on all my recent prints. It's a x axis pattern and raise up when the part get taller(photo attached).
The two faces in the photo faced to the front and back of the printer. So I guess it's related to X and Z axis? But not sure what I should start. I will print a calibration cube later today when I got home.

Looks like printer bed temperature fluctuations. pid tune your bed.