I've been having some problems with the HRM strap on my 405 lately, it seems to regularly stop picking up my heart rate and just displays my HR as 144 the zone info turns to " - - " and % goes to " - " (hopfully you don't need to read morse code for that to make sense). I thought that it might be the battery going and have replaced that but there has been no improvement. I've had it for about 2 years but would really prefer not to have to buy a new one. Any one got any ideas what may have caused this. As quite frankly when i'm running and glance to see that my Hr is at - % i'm in zone - - its slightly worrying, after all...it never turns out well being the undead does it? besides, i'm trying to train by heart rate at the moment so it is quite inconvienent to loose that info for minutes at a time. Sometimes, bashing it works, other times it doesn't - and that's as far as my techneaderthal mind will go to fixing a technology problem, although i must look a reall nutter, beating my chest whilst staring at my watch and running.