Hi @Alex , yesterday I figured the Auto-extended cooldown signal/sound is muted (no sound) when I increased the power target before getting into the Auto-extend 5 min. period.
I noticed last night workout but I had the same impression a workout prior to yesterday’s as well. Actually, yesterday’s workout was a fact because I was paying attention if it was gonna happen again.
I did changed the power with the + key up to 150% about 7 minutes prior to the end of the last interval.
Actually, it didn’t make the tone twice because rode 10 min (2x5min auto-extend cooldown intervals) and it never happened.
It used to work previously
My phone volume was all the way up and the incoming next sound/sign for regular intervals during the whole workout sounded perfectly 5 seconds before each interval
You can check my yesterday workout showing this, hope it helps out to clarify it