1.

The file is too big. You saved it on a USB flash drive, or there is not enough space on the mobile hard disk.

2.

There is a problem with your cache settings. Tools-Options-Memory.

Set the auxiliary disk, and the memory setting will be increased to 30%~40%.

3.

There may be something wrong with the text itself. Delete objects that are too complicated or unimportant, then create a new blank document, copy and paste it, and save it again.