I would recommend to make sure you are on the latest patch for version 7.6. older versions could have issues with swap space, but the newer builds have been good. if this is consistently happening on the latest patch, please call into support so we can take a look. it could be a mail loop or some other type of config problem. hope this helps.
Please upgrade to the latest patch.
Thanks a lot Jake. It seem to work with the latest patch as you advise.