build keep on failing in cruisecontrol

we have SVN CruiseControl(CC) that had been configured in the linux
machine. We have been using this server for a long time up to this date.
but lately the build fails and fixes by itself or sometime it requires
Server reboot to fix this issue. Each time it throws different error
messages as below.

   1.

   Ant Error Message: /opt/cruisecontrol/workdir/framework.xml:11: Unable
   to delete file
   /opt/cruisecontrol/workdir/checkout/PTPTN/ptptn/ptptn-build.672-N20120527/ReportTemplate/NEW
   REPORT - MAY 2012/NOTICE_SENT_REPORT.jrxml
   2.

   Ant Error Message: /opt/cruisecontrol/workdir/framework.xml:11: Unable
   to delete directory
   3.

   Ant Error Message: /opt/cruisecontrol/workdir/framework.xml:14: Can't
   checkout
   4.

   Ant Error Message: /opt/cruisecontrol/workdir/framework.xml:19: The
   following error occurred while executing this line:
   /opt/cruisecontrol/workdir/checkout/framework/source/framework.xml:102: The
   following error occurred while executing this line:
   /opt/cruisecontrol/workdir/checkout/framework/source/framework.xml:284:
   Can't checkout

We couldn't figure out what is wrong with the server.Any thought of why is
happening to CC?Or any idea so we can manage this problem?Thanks.

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