Could be.
I ordered 1 T3 and a spare head the first of October and ordered 2 T3s and 2 spare heads the first of November.
The T3 I got on my first order only had one column of numbers while the ones on the second order had two columns of numbers, so it would appear I got 2 different batches. The 2 that broke were from the second order because they both have the two columns of numbers. The first one I ordered, the one with the single column I carry as a spare and hasn't been used, so I can't say if it's in danger of breaking or not.
You are right...
I ordered 5 spare tanks (without heads) from GotVapes for $3.95 each just in case more of them break. I don't need any more heads, I have about 6 of the regular T3 heads, 5 of the new T3s coils and 1 T3s base. Plus I have 100 feet of Kanthal A1 32 AWG wire for making new coils, 5 of the positive center post insulators and miles of cotton threads from cheesecloth for wicks. As long as I can keep the tanks in stock it looks like I'm all set for a while.
I won't be ordering any more T3. Although I love the way they vape I'm having contact problems and even with an adaptor there's some jiggle on my eVic. That's a nono for me, I wanted to order some new T3S bases but they don't ship internationally. I prefer 510 connector for my mods, specially on the eVic that I use on the go. Strange enough, this last batch of T3 heads don't make contact, the previous batch did. It's a shame, heads are dirt cheap and I can't understand why I can vape eVods without adapter but not T3... We'll see