Quorum doesn't recover after zxid rollover

When zxid rolls over the ensemble is unable to recover without manually restarting the cluster. The leader enters shutdown() state when zxid rolls over, but the remaining four nodes in the ensemble are not able to re-elect a new leader. This state has persisted for at least 15 minutes before an operator manually restarted the cluster and the ensemble recovered.

Config:
--------
tickTime=2000
initLimit=10
syncLimit=5
dataDir=/raid0/zookeeper
clientPort=2181
maxClientCnxns=100
autopurge.snapRetainCount=14
autopurge.purgeInterval=24
leaderServes: True
server.7=172.26.134.88:2888:3888
server.6=172.26.136.143:2888:3888
server.5=172.26.135.103:2888:3888
server.4=172.26.134.16:2888:3888
server.9=172.26.135.19:2888:3888

Logs:

https://gist.github.com/mheffner/d615d358d4a360ae56a0d0a280040640