TortoiseSVN 1.6.8-11 Blame changes crashes Apache

Hi,
For some SVN elements/files "Blame changes" causes the stop of the Apache service.
During the last months we got sporadically crashes ( about 5 times the week ) of our Apache server ( version 2.2.9 on WIN2003R2 x64 SP2 ) which also serves SVN requestvia DAV_SVN. The error.log and svn logfile didn't show any relevant hint to the root-cause. Just an unspecific error occured :
 [crit] Parent: child process exited with status 3 -- Aborting.
We checked the load of the relevant server resources without any hint to a bottleneck.
Apache configuration has been optimized regarding thread handling without success. Please see attached http.conf.
By investigating the different mailinglists we found in https://issues.apache.org/bugzilla/show_bug.cgi?id=46845
an error description which matches with our crash pattern.
Now we could reproduce the apache crash for some SVN elements using the "Blame changes" command from Tortoise context menu likewise. The error occurs using "Blame changes" via showlog as well as directly selecting an element from WC. Please see attached snapshot. Command plain "Blame" works ok. Using the cmd-line SVN-client causes also an Apache crash :
Z:\TRUNK\source\common\ErrorCodes>svn blame -g ( --use-merge-history ) PLCFacade_ErrorCodes.h
svn: REPORT of '/svn/xNASoftware/!svn/bc/34829/trunk/source/common/ErrorCodes/PLCFacade_ErrorCodes.h': Could not read status line: Eine vorhandene Verbindung wurde vom Remotehost geschlossen.
Crash occurs also in last Tortoise-SVN 1.6.11
Got no hint while browsing the mailing lists mentioned in preparations for bug-reporting.

Kindly asking for help or bugfixing this problem.
Thanks in advance, K.Kosmol

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