Ever since 1.3.1, if I leave a server, and join, after one or two times of this, it can't reach servers and crashes if I try to load one. Closing the game leaves the process running, and when I try to end it, it doesn't go away. No errors given. When trying to connect to the server, as stated, it crashes. However, it stays responding, but nothing can be done, and it's unresponsive, even though windows thinks it's okay.
When it crashes, the RAM usage spikes, and so does the CPU usage.
I enclose my snooper settings screenshot for you to view.
I hope to get some information on this, thank you.
Proof : https://www.youtube.com/watch?v=TopvTSRU9UE
Note : Ignore the right of the screenshot. Accidentally screenshotted the other monitor too.
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Jesper, how do I go about doing this?
click the start button type %appdata% then click roaming (I assume you're on vista/7) then go to the .minecraft folder and then there should be some folder like crash reports or something. Search for that.

No crash report, we can't help you.
another tip. you are not using the current version of java. the current verion is version 7 update 9. upgrade your java.
http://www.minecraftforum.net/topic/1405977-minecrafts-java-process-will-not-die-on-closure-or-at-all-for-that-matter/
http://www.minecraftforum.net/topic/1405977-minecrafts-java-process-will-not-die-on-closure-or-at-all-for-that-matter/page__st__40
On the second link, the OP said
"Same here. I use NVidia.
I'm still getting this issue. I'm only getting this on 1.3.1. I'm running vanilla minecraft 1.3.1. No mods. 64-bit java (latest) and Windows 7 64-bit.
Sorry for the bump, but this is getting very annoying. Also I'm getting a strange bug on my end when trying to load the multiplayer list. If I try to use the multiplayer feature, on occasion, clicking "refresh" will cause the client to freeze.
Thanks,
Dragos "
Exact issue I have.
The process doesn't end either, as stated in description of this bug report.
I have found a mod which fixes the issue.
http://www.minecraftforum.net/topic/1461783-fixing-lag-and-freezing-when-joining-a-mp-server/
It is annoying as I have to use someone elses code to fix your game, and when the next update happens, this won't always be up to date! The person could just give up updating it at any time.
Well there you go Mojang - if you need to know what's wrong so you can fix it just go and look at what that mod alters.
Thank you Mojang, for finally understanding that this issue exists, and I cannot wait to see it fixed in vanilla.
yay
I think you are going to have to upload a crash report.