Connectivity problems on ATM MPLS network

We have implemented a country wide MPLS network based on 8500 platforms. We have encountered some strange connectivity problems between some PE's. Without apparent reason connectivity is lost between some PEs and restored after some time. The global routing table is perfectly stable among all the routers on the path between respective PE's. Also the LVC's & TAGs are stable and practically we were unable to find any change between the working and not working state. As a curious thing, during the outage (minutes) clearing routes into a PE VRF was restoring connectivity on the respective VRF and all other VRFs on the respective PE also!
Has enyone seeing similar problems before?
PE routers are 3660 series and we've tried all IOS available on CCO.

Have you made any provisioning (upgrading connectivity) bet the PEs and Ps....I suffer such a similar problem with our network PEs and I notice that this happen after provisioning links between our PEs (RPMs in MGX 8850) and the ATM LSR (BPX 8600).
when i issue "clear ip route vrf *" or reload the RPM.....all the VRFs operate normally again.....so I get used to such a problem after any network provisioning process but still i couldn't relate this to problems with VRFs.

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Connectivity problems on ATM MPLS network

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