My new 920xt doesn't seem to connect to mr hrm :( it didn't work at the gym the other day, I played eight it last night and it connected straight away, put it on this morning and it connected but by the time I walked out the door to go for a run it was lost. I thought maybe it had something to do with my phone because I left it at home but when I got home it connected to my phone and I still couldn't get the hrm to connect, anyone know what I'm doing wrong??