I've been getting a lot of both on my site lately. http://www.sportstwo.com. What I think is going on is users are clicking on the submit post button two or more times because they're on mobile and there's a lot of lag. I just read a thread where one guy submitted the same post 4 times in a row. I'm seeing only a handful (like 12-15) per day of these MySQL Lock Timeout errors in the server log. Any suggestions?