This is the same thread as here but I can see the thread has been closed.
It seems that the Keepalive processing stopped
2012:06:28-00:03:48 **** tspc[17583]: Your IPv6 address is ******
2012:06:28-00:03:48 **** tspc[17583]: Your IPv6 prefix is ******
2012:06:28-00:03:48 **** tspc[17583]: Your IPv6 DNS address is ******
2012:06:28-00:05:23 **** tspc[4220]: Keepalive processing stopped: General timeout detected.
2012:06:28-00:05:23 **** tspc[4220]: General timeout detected.
2012:06:28-00:05:23 **** tspc[4220]: Disconnected. Retrying.
The issue fixed this morning (2012:06:28-09:08:30).It seems that this started 2012:06:25-22:01:23
Is this UTM related issue?