While QC certainly sounds reasonable, I wouldn't want to rule out the deliberate, coordinated ongoing tweaking of something in the recipe and/or production process. They're openly doing the same as it applies to their drive to jab 5-12yr olds...

https://citizenfreepress.com/breaking/pf....

Is this some kind of patch to the program, hoping they can "fix" the known myocarditis bug?

Spitballing here.. but is it possible that the timing of these "hot" jabs also coincided with the mounting evidence of waning efficacy over time, earlier this year? Perhaps a collective consensus (or rather, collusion) amongst the supposed experts and manufacturers to make some uniform adjustment in something to do with the delivery mechanism in order to make it more potent and therefore hopefully effective for a longer period of time? Or just see which worked best... kind of a limited beta test. As KD has previously shown, they clearly set the initial antibody targets to a wildly high number in order to juice the the near term efficacy rates in order to kick this all off, so they're willing to play games. As other have mentioned, they'll do what they need to make the sale, then address any problems later. They clearly want to approach this whole DNA/RNA based stuff through the lens of we're just computers and they're the programmers... but they want us to believe it's conventional medicine.