This bug has been consistent since last few updates of Photoshop. The instant crash making loose all the changes I made up till the file was last opened in PS.
This crash is caused by the text tool. Specifically when I was editing a paragraph and changing the font to any other, as soon as I leave the text box and press Ctlrl+Z while, the program instantly crash without a single warning. There is no logical reason why the app is crashing very strange.
The file is 72 dpi, and 1080 square px sile. with normal text and images. So this is not a memory issue.