I have noticed previously that on the 5 min warm up, the app freezes and only restarts itself when i go back into the app on my iPhone, so i used to walk for nearer 10 minutes before checking. However, it is now also doing it during the runs, i was doing the 20 min run last week and i had been running for a long time, i looked and it said i had 18 minutes left. WRONG!! I used a GPS app alongside it and i had been running for 12 minutes already.
I was in a good mood, so i continued with the rest of the 18 minutes and ended up running for 30mins. Obviously very chuffed, but more annoyed as i now consciously keep getting my phone out of my pocket to check it is working still.
Anyone else had a problem like this?