Are you still getting these connectivity test failures?
I have been looking into an issue where the connectivity test requests timeout early or get aborted - If you are getting this problem still, I would like to have verbose logging also enabled - that would show if the requests are being aborted leading to the connectivity="0" events you pasted in above.
If there is evidence of that. then the next step would be to get traceroute for the failing / aborted connections IP addresses and see what delays are in the route.
I have posts here about it in here Remote Access connects for about 15 seconds then disconnects - #161 by sa2000
