I've noticed maybe 5% of the time, walletnotify setting within bitcoin.conf will fire off duplicate messages, or at least dupes that my software can't pick up.

Ieven went as far that when a notification comes in, system immediately checks redis for a dupe.  If txid is not in redis, adds it, and processes the deposit.

That doesn't even work though, as sometimes dupes will make it into the system.  Apparently the notifications are so quick in succession, a quik connection to and check in redis takes too long.

How can I resolve this?