Log4j logging stops intermittently

Question

We're experiencing some stoppages on our log4j(v1.2.8) INFO logs. We're using a WebSphere(8.5.5) clustered server(vertical) with 3 members that runs on a single machine(UNIX). Stoppage is random; no specific file size, time or when about to rollover

We've first suspected that is a volume related problem as we've tested before on a lower volumed server the problem doesn't occur. I've later tested overloading this server but I could not replicate the problem.

Average daily production is 175,000 INFO lines. A workaround is available by just changing the timestamp of the log files to resume logging.

Already looked into the suggested fix on Log4j suddenly stops logging but nothing seemed to work. I'm hoping I could get some advise on were to look. Thank you.

log4j.xml:

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
    <root>
        <priority value="INFO" />
        <appender-ref ref="TEST" />
    </root>

    <appender name="TEST" class="org.apache.log4j.RollingFileAppender">
        <param name="encoding" value="UTF-8" />
        <param name="file" value="$test/directory/logs/test${com.test.log.server.name}.log" />
        <param name="MaxFileSize" value="10000KB" />
        <param name="MaxBackupIndex" value="50" />

        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern" value="%d{ISO8601} %-5p [%t] [%-12X{username}] [%-12X{servlet}] [%c{1}] %m%n" />
        </layout>
    </appender>

    <appender name="console" class="org.apache.log4j.ConsoleAppender">
        <param name="Target" value="System.out" />
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern" value="%-5p %c{1} - %m%n" />
        </layout>
    </appender>
</log4j:configuration>

The value of ${com.test.log.server.name} is declared in WebSphere JVM custom properties on each application server.

Any help would be greatly appreciated.