Wildfly datasource jdbc connection became invalid suddenly from valid

Question

I have configured jdbc datasource connection. It was valid previously but after some days it became invalid. If I restart server, then again It starts getting valid. What could be possible issue here. I have deployed ojdbc7.jar in console for connectivity to oracle database. I am able to connect through sql developer also but in wildfly only it became invalid after few days. Everytime, I cant restart server to solve this issue. I am using wildfly-21.0.2.Final Please need help here.

standalone.xml

<datasource jndi-name="java:/CLCIDataOra" pool-name="CLCIDataOra">
                    <connection-url>jdbc:oracle:thin:@{hostname}:1524:{sid}</connection-url>
                    <driver-class>oracle.jdbc.driver.OracleDriver</driver-class>
                    <driver>oracle</driver>
                    <security>
                        <user-name>{username}</user-name>
                        <password>{password}</password>
                    </security>
                    <validation>
                        <valid-connection-checker class-name="org.jboss.jca.adapters.jdbc.extensions.oracle.OracleValidConnectionChecker"/>
                        <background-validation>true</background-validation>
            <background-validation-millis>60000</background-validation-millis>    
                        <stale-connection-checker class-name="org.jboss.jca.adapters.jdbc.extensions.oracle.OracleStaleConnectionChecker"/>
                        <exception-sorter class-name="org.jboss.jca.adapters.jdbc.extensions.oracle.OracleExceptionSorter"/>
                    </validation>
                </datasource>