JDBCAdapter Polling Notifications stop working

Hi

All the Adapter Polling Notifications ( JDBCAdapter, Version 6.0.3 ) stop working in the IS ( IS Version 6.0.1, Updates IS_6-0-1_SP2_Fix106 and IS_6-0-1_SP2 ).
What a mean with Notification stop working, is that polling is not made in tables, and the request are not processed

There is no explicit error message in the server.log file. The only message that I can get is Connection:null

example:
Adapter Runtime: Sending ISM status of 2 for node VfWeb_AdaptSrv_EB:EB_PROVISIONING_REQ_BUFFER of type 1.
Adapter Runtime (Notification): useConnection Connection:null for Notification:VfWeb_AdaptSrv_EB:EB_PROVISIONING_REQ_BUFFER UUID:a63e05d27676516ffc2dc83383.
Adapter Runtime (Notification): Default startupCallback Invoked for Notification:VfWeb_AdaptSrv_EB:EB_PROVISIONING_REQ_BUFFER UUID:a63e05d27676516ffc2dc83383.
Adapter Runtime (Notification): startupCallback Invoked for Notification:VfWeb_AdaptSrv_EB:EB_PROVISIONING_REQ_BUFFER UUID:a63e05d27676516ffc2dc83383.
Adapter Runtime (Notification): useConnection Connection:com.wm.adapter.wmjdbc.connection.JDBCConnection@5bcc8a for Notification:VfWeb_AdaptSrv_EB:EB_PROVISIONING_REQ_BUFFER UUID:a63e05d27676516ffc2dc83383.

I try to restart the Polling Notification, restart JDBC Adapter Connections, make reload packages, but nothing works.
Only the restart of IS solve the problem.

Has anyone else have this problem?
Thanks in Advance
Rui