If you look at the traces in trace view, what type are they ?
Trace Type: Normal or Trace Type: Sampled
That would help to determine the origin, especially if they would be majority 'sampled', sampling is an easier thing to control, I can see you have configuration for it there but would have to check if the EM can still send a request for sampling even so.
But Normal covers most other things, we don't have a trace type for automatic/deep things by itself.
Or if the traces show any AutoTrace Trigger Description, it can be something like an error, new transaction path, threshold breached (related to DA)
Is it always the same component (method/class) in the traces or a variety of methods/classes ?
or under errors tabs, if there are a lot of repetitive errors there, either see if the errors can be fixed or reduced, or set configuration in the agent profile to ignore the errors if the errors are 'expected'