Hello,
This is a bug I have reported by email during the previous beta and is still present in 3.30.
During a Trail Running activity, with HRM Tri connected, and the phone connected to the watch, I cannot stay on a specific data screen. At some point during the run, the watch goes back to the first data screen and switches to white text on black background. If I go back to the data screen I'm interested in, it swithches back to that first data screen after some time.
It seems to be related, or maybe it's just me trying hard to find a reason, to the watch receiving notifications during the activity (like the Android phone complaining about having lost the selected cellular network).
It always happens to me in trail running activity, not in normal running.
Best regards,
F.