Heart Rate monitor - going crazy

Ok, so I've had my Garmin 305 and my Heart Rate monitor since August time, with no problems at all. However, over the last week it's become very erratic and had been giving me some really strange readings - today during my warmup it said I hit 97% of my maximum heart rate and last week I was 115%...

The thing is, I haven't been doing anything differently. I've made sure I've wet the contacts enough so I get an accurate reading, I've tightened the strap so there's constant contact with my chest, and I haven't been putting it anywhere different from normal (I tend to put it just below the bottom of my ribcage). And I'm getting these really erratic readings (although Sporttracks does a good job of smoothing out sudden peaks).

What's your opinions? I can't think it would be the battery, it's only 7 months old and runs off of a watch battery... image


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