I've had it happen a number of times.  Since this happens because the page times out due to lack of activity, it is particularly frustrating because I have a long well thought out posting.  Flash its gone.

I handle it one of two ways, one is to copy with my mouse before I submit.  I put it on a notepad and see what happens when I submit. If I lose it. I start again, but paste the whole thing back quickly and  I am done.

If I forget to copy it, submit and loose it, I back space and that may bring it back.  Then I copy it and repeat the above.

Another way is I type it onto a word or works so I can use its spell check since my browsers are screwed, then cut and paste.  I use my home lap top and need to play with my software, it skips letters helps me invents words and makes an undiscovered literary genius out of me. (I don't know the sign for vomiting)

Any questions PM me

Happens all the time..... Just happened to me yesterday......

When you are reminded that your session has expired, simply sign in then hit the back button twice and all your information should still be there for you to send for approval.

Not sure why you are losing all your work unless you don't understand that it is still there behind the scenes but in another window.

You type to slowly.  Others have said this, type the details in a word processor program, save it, and then just copy into the review.  That's what I do, and thus I have a copy of the review that I can save in case there are any problems on TER's end.

Swim