> This NullPointerExceptions lasts for each statement during a period
> of 1 or 2 hours and vanished then. Sometimes an exception can heal
> this erroneous behaviour.
>
> Has anybody an idea what could be wrong.
> Could it be a solution to try newest Jaybird release?

Can you post a stack trace. It is hard to tell whether new release might fix
the issue without knowing the issue itself.

Roman