Pace alert/notifiction during activity

Apologies if this has been asked before, but I have been searching a few times, trying something, failing, searching again...

I have a lovely Epix2 as of a few weeks ago, still setting it up and playing around to get the most out of it. However, it has one "feature" that is driving me mad at the moment, and I cannot work out how I have enabled it/how to turn it off.

Mainly trail running at the moment given the time of year, so my question pertains to that app/activity. Out on a run, I am getting (intrusive) alerts when I moving between HR zones, and frequent updates on pace. If these were only vibration then I could live with it, but the blasted tone is ruining a nice, peaceful, activity.

What have I checked so far?

- I'm not using an workout/coaching functionality

- I have not set up any custom alerts in the activity

- Audio prompts are not enabled

Pretty much every feature is turned off, trying to find the culprit. About the only thing left is that I am using the HR gauge as a data field, along with pace, and I am calculating V02 Max.

Please could someone give me a hint as to where to look next?

Many thanks,

Julian