Strange connection problems with Policy-Based VPN

[naudski]

Hi,

For a few weeks we are experiencing strange connection problems with policy-based VPN tunnels. Once and a while new TCP connections to the remote hosts aren't working anymore. Already established connections keep working fine. The policy-based tunnel is UP and I can't see any errors, but I can't reach remote hosts by making a new connection, for instance through ICMP or telnet to a remote port. The only way to fix this is by resetting (bring down and up) the tunnel.

Any ideas??

We are using a VDOM on a 3240C. Version 5.6.x