pg_standby triggering unexpectedly

I have been having a problem with my redundant PostgreSQL setup over the last couple of weeks. I run two Postgres servers with a WAL Logging Warm Standby system using pg_standby from 8.3. When the master server is under heavy load and generating a lot of WAL traffic the secondary server has been tripping and going active.

After checking all the logs and putting pg_standby in debug mode there was still no clue as to why this was happening.

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