Log4net RollingFileAppender losing files during rollover

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log4net

Hi,

I've a RollingFileAppender that appears to be loosing files at some point.
For example: I have the following log files in my log folder

applog.log.220
applog.log.221
applog.log.222
applog.log.224
applog.log.225

For some reason, applog.log.223 is missing. When I look at the last log message in 222 log and compare it to first log message in 224 log, I see several minutes are missing. In some cases it would be as little as 5 minutes and as long as 45 minutes.
below is my config:

<appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
      <param name="File" value="D:\Log Files\applog.log"/>
      <param name="AppendToFile" value="true"/>
      <param name="RollingStyle" value="Size"/>
      <param name="MaxSizeRollBackups" value="1000"/>
      <param name="MaximumFileSize" value="20MB"/>
      <param name="StaticLogFileName" value="true"/>
      <param name="CountDirection" value="1"/>
      <layout type="log4net.Layout.PatternLayout">
        <param name="ConversionPattern" value="%date  %-5p %25.25c [%x][%5thread] - %message%newline"/>
      </layout>
    </appender>

any help would be appreciated.

thanks