log4j files get emptied when restarting tomcat?

[Michael]

I am currently experiencing some strange behavior with log4j. Sometimes when
I restart Tomcat the day's log files are emptied, i.e. starts with the
messages coming from the restart. That happens just about every 5th time I
restart.

OS is Debian on a virtual server, for restart I am doing
/etc/init.d/tomcat5.5 restart


* Tomcat 5.5
* commons-logging-1.1.1
* log4j-1.2.15


<appender name="allAppender"
class="org.apache.log4j.DailyRollingFileAppender">
    <param name="datePattern" value="'.'yyyy-MM-dd" />
    <param name="file" value="/var/log/tomcat5.5/all.log" />
    <param name="Append" value="false" />
    <layout class="org.apache.log4j.PatternLayout">
      <param name="ConversionPattern"
             value="%d [%t: %C.%M:%L] %p: %m%n" />
    </layout>
  </appender>

 <appender name="buidlAppender"
class="org.apache.log4j.DailyRollingFileAppender">
    <param name="datePattern" value="'.'yyyy-MM-dd" />
    <param name="file" value="/var/log/tomcat5.5/buidl.log" />
    <param name="Append" value="true" />
    <layout class="org.apache.log4j.PatternLayout">
      <param name="ConversionPattern"
             value="%d [%t: %C.%M:%L] %p: %m%n" />
    </layout>
  </appender>

  <logger name="buidl">
    <level value="info" />
    <appender-ref ref="buidlAppender" />
  </logger>

  <root>
    <priority value="warn" />
    <appender-ref ref="allAppender" />
  </root>