JBoss 5.0 log file is stopped getting updated after a while

We are using log back xml to configure application specific log file and copied the log back XML in JBoss class path. After server restarts, JBoss is generating the log files successfully. It was working from some time even in production. Recently we have noticed a weird issue in our dev environment that, application logs are writing in to log file and stopped writing after a while. We have to restart the JBoss to get back the Log files status. This issue seems coming continuously now a days. I would like to know is it some thing related to JBoss or more of environment issue.

Here below the log back configuration we had

<appender name="FILE"
class="ch.qos.logback.core.rolling.RollingFileAppender">
<File>${jboss.server.log.dir}/cbs2.log</File>
<Append>true</Append>

<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<FileNamePattern>${jboss.server.log.dir}/cbs2.%d

{yyyy-MM-dd}

.%i.log.gz
</FileNamePattern>
<timeBasedFileNamingAndTriggeringPolicy
class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
<maxFileSize>200MB</maxFileSize>
</timeBasedFileNamingAndTriggeringPolicy>
</rollingPolicy>

<layout class="ch.qos.logback.classic.PatternLayout">
<Pattern>%d

{yyyy-MM-dd;HH:mm:ss.SSS}

[%thread] %-5level %logger

{36}

[%M:%L]
[%X

{id}

->%X

{bcId}

:%X

{userId}

:%X

{loginId}

] - %msg%n</Pattern>
</layout>
</appender>