I also buy a years supply of IO every boxing day at Big Als (9 buckets). I go through a bucket every 6 weeks.
Had no problems with any of my 2013 buckets and I'm on bucket number 3 from this past boxing day 2014 with no problems so far.
I would seriously look at possible sources of contamination or maybe a drastic change in salinity due to a uncalibrated measurement tool.
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