When I am not in a run or trail run, my timer works normally, providing sound and vibration when the time is up. When I try to use timers during a run or trail run activity, the timer elapses without making any sound or vibration, and the watch often goes back to the run interface, making the timer useless. Am I doing something wrong? Is there no way to use a timer during a running activity without stopping the run, doing the timed intervals and then starting the run back up? Any advice would be greatly appreciated. Thanks!