and i will disagree as well since running the older version means i'm not going to have the log data needed and so cannot resolve the issue and provide the a newer build as you're asking for.
the 2011 version is not even comparable to the current builds, hence why i said if you are going to roll back, at least go to 2.2.1 and not 2.0 - as 2.0 blocks client connections if the YP is not contactable which is even worse than having the stability issues.
and the issue happened again with the 32-bit version but you / your host have not provided any of the requested full debug logs? so we're back to square one with no information to try to provide a fix for an issue we're not able to replicate *joy*
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