I've had this problem in the past but it's been okay of late. Not sure of the cause.
I am now in the habit of copying the text to memory before clicking anything, that way it's easy to just paste it back in again if anything goes wrong. A simple Ctrl+A (to select all the text) followed by Ctrl+C (to copy). Sorry don't know the Mac equivalents.
Write your post in Word or your preferred text editor. It will be spell-checked too, which works better in Word than in a browser. For instance, it picks up missed upper-case letters that a browser check misses.
When you're happy cut, paste and post. If you lose the post, you still have the original Document to try again.
Not that I am doing this one like that. I'm gonna copy this afterwards, just in case. It will be in the memory if I need to save it. :mrgreen: