I set a 4 oz size bottle outside ( day and night) for 48 hours, it separated, after shaking the crap out of it, it went back to what the rest of the bottle looked like.
I was testing to see if below freezing temps made a difference. Sorry, that didn't do what you said yours did, so maybe you do have an old bottle, it probably happens from time to time.
And yes, even in AZ, it freezes, not much here, but nights have been 25-27, days 65-72, so it got a wide temp range outside.
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AZ Guy aka: R & L Bowlers Pro
rlbowlerspro@cox.net
www.rlbowlerspro.comSleep is over rated.