Hallowed, that's great, thanks for the follow up, and good luck with that brew.
I may have this frozen yeast issue again in the future due to winter deliveries, so another data point 'tis good!
I should clarify my previous post. Although the "gushers" I experienced could have been due (of course) to a wild yeast infection, for various reasons I'm suspicious that was the cause. Instead, I'm thinking the gushers could be due to (as a bilogist might say) natural selection due to a bottleneck event. No not the bottleneck I drank them from, but rather the fact that one might think that a large portion of the yeast died off during a weekend spent in ice. The ones that survived could have been merely lucky, or perhaps they had some "special" genetics/characteristics that enabled them to survive in harsh conditions.
It's interesting to note (that I've heard from pros) that priming for bottle conditioning tends to "awaken" the native yeast, and can result in them consuming not only the priming sugar but also some of the residuals, resulting in a dryer beer. Not sayin' this results in a gusher, mind you, just a related and possibly intertwined topic after a possible genetic mutation. Any biochemists and yeast specialists... I would be interested to know if the genetics of a wyeast pack could possibly drift so far so quickly, given such a drastic event that might kill off 95% of the yeast?
Anyway, that's more or less why cold storage of your finished beer could be especially good in this case.