I am using the Creality ender 3 v3 SE with eSuns PLA+ in black. The recommended printing temperature is 205-220 and I am printing at 210. The bed is set to 65°. When I print somewhat flat parts. The edges warp off the plate, while the printer is running and the plate is still hot. Until a few days ago it worked perfectly and I don’t know what I am doing different.
It is always only the first few layers, and the print never moves, so that the printer would make spaghetti, its just the edges that lift of a few millimeters.
Wash your print surface with dish soap and water and dry with a paper towel or fresh towel. Avoid touching or contaminating the surface once clean and dry.
If that doesn’t work, get some magigoo
You can also increase bed temp and slow down the early layers. If those fail adhesive is the way to go. Definitely washing is the best first step though.