server.dat file changes into server.dat_tmp after refreshing and entering servers (and leaving), not sure about second trigger though.

Hello moyang. I've been dealing with this bug several months and I think it has been reported, but I'm not sure so I'm posting this anyways. When I refresh my multiplayer serverlist it has a chance to 'delete' itself. I've searched the interwebs and it seems like something can't keep up, so the server.dat file is getting renamed to server.dat_tmp or something like that. if you rename the file back it works again. But i'm tired of doing that many, many times a day. Just to be clear, I have my .minecraft file open on my computer, so everytime it happens, I can just rename it and it only takes half a minute. I hope this finally gets fixed (maybe you could make it so that the server.dat_tmp file also gets regonized by the client, but the server.dat file has priority?) I know nothing about coding. Thanks in advance and keep working on this beautiful addictive game you are making.

Steps to Reproduce:
1. refresh your minecraft serverlist until it deletes itself