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Typically you should refrain from modifying the tuning parameters before making sure the exact cause of the issue. The defaults should be
What is the exact error message you are getting? Can you also check the message on the PI Server logs.
How many points are you subscribing to? What is the type (TimeSeries, Snapshot) of subscription?
Could you please share the your code snippet on how you initialize and call the Observer Events?
Are you able to reproduce the issue with this utility which uses similar PI data pipe and observer pattern PI DataPipe Events Subscription and Data Access Utility using AF SDK - PIEventsNovo
The pipe check frequency (def=3sec) and pipe max event count (def=100) can be modified using the config file for the exe.