PF occasionally "losing" packets

[user]

Hey Everyone,

I seem to have a problem with PF "losing" packets.  With PF enabled 
(7.0-RELEASE) allowed traffic will sometimes get through but more often 
will not.

More specifically, from the logs I can see packets passed into the 
internal interface, but they often do not trigger the outbound rule even 
though I allow everything out.

pass out quick log all
pass in quick log on fxp1 proto {tcp,udp} from X.33.195/24 to X.33.10.20 
port 53 keep state

Sometimes BIND requests will get through and I can see both in/out rule 
trigger and get logged.

More often, I see the following in the logs when the nslookup fails:

4. 835454 rule 21/0(match): pass in on fxp1: X.33.195.244.45453 > 
X.33.10.20.53: [|domain]
242279 rule 21/0(match): pass in on fxp1: X.33.195.244.45454 > 
X.33.10.20.53: [|domain]
3. 756975 rule 21/0(match): pass in on fxp1: X.33.195.244.45455 > 
X.33.10.20.53: [|domain]
242070 rule 21/0(match): pass in on fxp1: X.33.195.244.45454 > 
X.33.10.20.53: [|domain]
7. 756284 rule 21/0(match): pass in on fxp1: X.33.195.244.45456 > 
X.33.10.20.53: [|domain]

Even though the packets are allowed in, they often never get to the 
outbound interface. Note that this is not limited to bind requests.  I 
see the same thing with ssh, ping, etc.

I've checked the routing table, interfaces, etc....   I can't seem to 
pinpoint the cause.

Has anyone seen this inconsistency?

Thanks in advance for any help.

Louis