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It seems like you have some under extrusion at the second half. This could have multiple reasons:
Clogged nozzle
Nozzle temperature is too low (unlikely)
Your extrusion motor is overheating (and is shutting down!)
Your extrusion motor doesnt get enough power (unlikely)
Your extrusion gear wheel lost grip on the filament
It could also be that your bed is not flat.
I would check your nozzle for clogs.
You’d better use blue tape (used for painting - outdoor version), sticks incredibly well and keeps your hotbed clean!!!