Giving up on iPhone

I truly believe my iPhone is trying to kill me. Today I was supposed to walk for five minutes then switch off jogging for sixty seconds and walking for ninety. So I start my 5K run app. The first five minutes seemed ok but then it was having me jog for two minutes and twenty seconds. Walk for ten seconds and repeat. I don't care it was telling me sixty seconds and then ninety. Maybe an android app would be better. Maybe this was just my perception. No my phone is trying to kill me.