I have a dedicated server (Linux) on 1-and-1 hosting company. I recently upgraded Plesk on my server. It seems it caused a lot of problems. Almost every day all the websites shot down because the server does not work properly. Sometimes the problem is fixed by rebooting the server from 1-and-1 control panel. But sometimes it does not work. I am not sure if the latest edition of Plesk is buggy or something was wrong with the upgrade process.
Please contact me ONLY-and-ONLY if you know Plesk very well and know what you are doing. You need to be skilled and experienced to fix the server's problem because I don't want to have to see my daily disconnections again. Contact me with direct PM.