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Heart Rate measurements brutally inaccurate during work outs

I'm not sure which update did it, but for the last 2 weeks I've noticed that heart rate measurements while I'm working out are terribly inaccurate. After my first circuit when I know my heart rate is 140-150 the watch will tell me it's 80-90. My heart rate after my warm up before I even start a circuit was showing 114... so it went DOWN after I started working out? I've found that the HR accuracy bounces from good to bad to good again often with software updates, but this is the worse I've ever seen it. Anyone else seeing this? Garmin can you fix this? PLEASE?