FC6 Xen stability?

Can anybody offer their experience running a production
FC6/Xen environment?

I'm looking for big uptimes for a mix of FC5/FC6
paravirtualized guests.

I'm currently running FC5 as the host using the non-PAE 2133
kernel.  I 
had issues (random lockups and network failures after 2-3
days) with the 
next 3-4 kernels that shipped after 2133 so I got off the
upgrade 
treadmill but as a result I'm pretty far behind.

I'd like to get current and switch to PAE but I'm really not
looking 
forward to more problems so I'm wondering about the
stability of current 
FC6?  In particular if you have a favorite kernel/Xen
version that's 
produced high uptimes I'd love to hear about it.

Thanks,
--Tony

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