Balance 20. After updating to 7.0.1 in June, I started seeing 10-15 WAN 1 health check failure notifications daily. The disconnects were typically for 1-2 minutes. Today, I finally became annoyed enough to try to determine the cause. I tried various changes to the health check parameters to no avail. Looking at the support.cgi page, I found that there were many, many more failures short of generating a notification. I downgraded back to 7.0.0 build 3310. End of the problem.
I spoke too soon. Things were perfect for about four hours. Now back to disconnects. Discouraging.