Countdown timer during activities not working

Just noticed that the countdown timer doesn't sound while doing an activity which is very annoying. I got the timer alarm after stopping the activity, long after it was due.

Don't know if there are some settings affecting this, but this is how to reproduce:

1) Start a countdown timer of 2 minutes

2) Start an activity

3) Wait 4 minutes

4) Stop the activity. In the middle of presenting the activity summary, the countdown time goes off.

Instinct 2 Solar with version 7.03