ERROR : 3260 An internal buffer has become full
The reason I have picked to write about this error is because we have encountered this error many times in one of our older server.
We were not able to absolutely reduce this error but following changes helped.
1) Rebooted server if error is happening frequently.
2) Increased RAM to Server.
3) Increased RAM allocation to SQL Server application.
Reference : Pinal Dave (https://blog.sqlauthority.com)