There are two other ways to try also:

If you aren't losing internet connection, then once you have typed your post, before continuing... highlight the post and hit CTL "C" (the control button and the letter "c") This will copy it. Click on continue for your post to be submitted. If it is, then no problem, if the post is 'lost' then you can either hit your "BACK" button (and if the post is there, resubmit) or if you have a blank window and no post: put your cursor into the text box, then hit CTL "V" (control button, "V" letter) and this will paste what you saved into the box.

Note: you do not have to hit the control CTL button and the letter AT THE SAME TIME, but you do need to hold the CTL button down as you hit the "c" or "v."

If you end up with the dreaded double post, you have nearly an hour to Edit it and delete it