This is a classic example of a first layer adhesion problems associated with a dirty build plate. The simplest and most effective way to clean it is to wash it in your kitchen sink. Use dishwashing detergent and smear it on your build plate. Any detergent that is fragrance and moisturizer free will work. Dawn(fairy liquid in the EU) and Palmolive dish soap are perfect. Run the hottest water on the plate, take a generous amount of detergent and coat the plate. Then using the the sprayer at your kitchen sink, blast off all the soap. Repeat this twice and dry with a paper towel.
Here is a post that covered this topic:
I posted some photos on that link that illustrate what can happen when you plate isn’t clean. Washing your plate is important! - #3 by Olias
But before you do that. To provide you with a visual test. Perform a first layer test so that you can visible see where the plate adhesion is failing. Don’t bother with downloading first layer test models, those are a waste of download bandwidth. Here’s how to do it in your slicer.
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Right-click and add a cube primitive.
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Using the size tool, scale the cube to a larger area, 150x150 is large enough to cover the center and will print quickly. Make the height 0.28mm so that only one layer prints. So when your model is complete it should look like this.
Which will produce a sliced model that looks like this.
This test is a perfect way to reveal where the contaminants are on any build surface and is quick and easy to print. If you want to test your entire plate, the largest the slicer will generally accommodate on a P1 or X1 is 240x200mm and you’ll have to center it.
Alternate Test
You can also simply move your model to another less-used part of the plate which likely will have less contaminant. If it sticks there, you have your smoking gun.
Alternate problem.
You filament may be wet. Even PLA can absorb moisture. Scan this forum for filament drying techniques.