I recently got my 235. Going great then must have done something to a setting. Now when I'm out it constantly beeps and vibrates saying hr low. It does it so much that there are times on my run that I can't see the Screen for info on pace etc. Even when I change the screen the heart rate keeps taking over saying low. Really annoying as want to see my pace. I've turned off found and I could turn off vibration but ideally I just don't want it flashing up as want my speed and distance etc. How do I do this? My running club would greatly appreciate help as driving them mad too!