We had an issue with this on a PA-3020 with 7.0.8 that was quickly fixed by just clearing out the connection info and adding it back in and letting it sync up again. I'm not sure when it actually took place as prior to me taking over that particular firewall they were not really utilizing it at all.
Upgradding the PA-3020 to 7.0.10 and then to 7.0.11 and I haven't had the issue come up since.
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