server errors

I use MT4 since 2007 and could manage all the problems up to to the product developments and bugs involved. But I got major problems with the new 600+ build. When I first got the forced upgrad I detected, that with the new version several EAs did not work anymore and also all the presets were deleted. Therefore I decided to block this upgrade by some procedures, which were published. This worked well until this Monday. With the restart all my build509 MT4s were upgraded to build 646.

The first I saw, that it was not possible to open more than 32 instances of the MT4 (I usually run more than 35 instances parallel wiht no problems up to now, max 30% CPU load and 11% Ram usage).

But the main problem was, that my server got unstable and I had to restart it about 3 times/day. Sometimes I was connected and saw the effect. The screen showed suddenly flipping around very fast fragments of the MT4s. I got no control over it and had to restart the server. This had nothing to do with the traffic. Yesterday this happened one hour after the market was closed. I could see also fragments of the task manager I had opened. It showed 5% CPU load and 11% RAM usage.

I have changed all my EAs to the version, which is adjusted for build600+.

This are the data of my dedicated server:

Windows Web Server 2008 R2 64 bit

Intel Core i7-3770 CPU 3.4 GHZ

32 GB RAM

And this is the last error message:

</Event>

Any idea, how I can fix this?