Why did egyptians stop using papyrus?

Because it was mean to be used in the way they did.

One of the most admirable deeds of the ancient Egyptians was their writing. The first Egyptian writing was a system of figures called hieroglyphics. By 3100 BC the Egyptians were already using this type of writing. They carved or painted the symbols on the walls of tombs and temples. Later they developed other simpler forms of writing. The Egyptians used these forms to write on papyrus, a material similar to paper.

elizabeth loftus conducted a study to observe the reliability of eyewitnesses during the 1970s. their baseline was to define how accurate are the recollections of eyewitnesses.

her studies do not support the use of eyewitness. loftus mentions in her work that we are not required to recall some experiences, meaning that rarely an individual eyewitness testimony is trustworthy. a good example is presented in her work, where all individuals watched a video and were than asked "about how fast were the cars going when they hit/smash? ". the testimonies changed based on the word she used to make the question (hit or smash), proving the fragility.