Error: 9245, Severity: 16, State: 1. / During the last time interval XXX query notification errors were suppressed
The error 9245 message appears to be directly connected to the 'The query notification dialog on conversation handle...' message in that SQL Server 2012 SP1 appears to only show that error a maximum of 10 times (with the same timestamp) in the error log, the rest are aggregated into a single error message:


  During the last time interval 257 query notification errors were suppressed.


Which is preceded by the message:


  Error: 9245, Severity: 16, State: 1.


Prior to SQL 2012 I do not believe the error notifications were aggregated at all, and did not result in a severity 16 error.