TextEdit bug- content keep going missing but reaapears some time

Hi Apple Team , I am afraid to share that there is possible serious bug in the TextEdit of MacOs High Sierra-10.13.2, i always miss some content in the textEdit and open slowly and scroll down, sometime i get back content and soem time i need reboot the machine but it is very inconsistent the content in the TextEdit has been copied from web/open office.

if possible Please look into the bug.

Cheers

raky