I noticed that after the newest beta update the timers only vibrate once. Usually when setting up a timer it keeps vibrating until you stop it or pause it. But again thia time around it just vibrates once and that's it. So I could literally not know if it's a timer or a notification..
I'm not having this problem. I have set several 2 minute timers since the update and it keeps going off until I stop it. Not sure what to suggest to you though. I didn't change anything on my part to get it to work properly.
