How-dee!  Has anyone experienced any problems writing reviews here?  Every now and then, when writing a review the editor will freeze and depending on when the draft is saved, I might lose a significant portion of what I wrote.   The last time this happened, I didn't notice the freeze until I had typed a lot of text and my attempts to recover from the freeze resulted in a draft that was saved, missing the text I was trying to prevent from being removed.  lol

Has anyone else experienced this kind of thing writing reviews?

I usually compose offsite in Word and then, when I'm happy, cut and paste it in

With a review in progress, I copy and paste it on a clipboard in case I lose it due to some glitch.  I, too, have OCCASIONALLY gotten an error message when trying to change screens here, and whatever I was working on is lost.  Copying and pasting it somewhere else before you change any screens here will prevent this.  Just minimize the TER page you are on, then access a clipboard and paste your copy to secure it, then enlarge the TER screen and close it out.  

 
When you log back in to work on the review again, if anything is missing, retrieve it from your clipboard or wherever else you put it and paste it back in.  Do the same thing when it is finished before you click "submit."  This happens VERY rarely, but it has happened to me a few times.  I spend about an hour on average writing a review, so it's worth going through these precautions to prevent a loss of the content.  

way to avoid a glitch blowing away a review before you’re finished writing it—compose it someplace with autosave, and preferably a full-feature grammar and spell-checker, then copy/paste in into the review page when it’s ready for submission.

Are you using a VPN? Are you on an internet connection or have some sort of browser setting that "times out" if it thinks there is no activity (keystrokes = not activity; clicking on a link = activity)?  Does TER have a "time out" feature? I think TER does have a "you get logged out if idle for too long" timer, but I don't know the time settings. I think it's a couple of hours, at least.  
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If your VPN is an onion router, you can lose connectivity and keep typing away and not know it.  
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When I am typing up a post, I keep one or more TER tabs open. BEFORE I hit "Post Message", I test one of the other tabs to see if I'm still on a good connection or not. With my VPN, I go to the browser dropdown and select "Choose another circuit." That reloads the "test" tab but it refreshes the circuit and connectivity for ALL open TER tabs. Then "Post Message" works and doesn't end up going down the drain.  
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It has been suggested (on S&P) that TER consider switching some features over to free Open Source software, e.g., Open Source Forum Software. A consortium of programmers keeps everything up to date, adds features, does a lot of debugging, etc.. Good forum software and Private Messaging systems allow for the saving of drafts as you type, allow the saving of drafts so you can return to them later to complete a submission, and have other good features.
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In re: the suggestion to use Word and then cut/paste. I don't like to leave ANYTHING on my computer that is even weakly TER associated, not even a draft or a deleted (but not bleached) file or clipboard. I haven't written a review in a while, but I would open a new Post or Reply and start typing in the big box.  I can use that as my editing window. Even if my connection freezes or changes, I can keep typing. After I cut and paste to another box ("Juicy Details"), and "Choose another circuit" to make sure I'm connected, I can go back and Clear or Cancel or Close the Post or Reply window. Then, I can Submit the Review knowing that the circuit (connection) is active.

Thanks for the replies, everyone!  The tip on composing in an external editor of some kind is a good one.  

Regarding VPN use, no I don't use a VPN.  When I have encountered the issue, I was able to navigate away from TER submission form without issue and go back to my draft review just fine.  It seems like the editor widget used to hold the review content hangs or encounters an issue of some kind.  Since there's a counter of the number of available characters, I presume it's a JavaScript-based editor/component/widget of some kind.  Maybe the next time I write a review, I'll open the browser console and see if any errors appear.

Anyway, thanks again for the responses!