How many here are willing to pay for climate controlled shipping? That may be the only way to ensure protection against damage to what is a moderately fragile product.
In this world where the majority of product is shipped huge distances using the cheapest option, there seems to be a wilfull blindness to the fact that film is relatively fragile, and probably should receive a bit more care than is provided by your usual FedEx employee.
There is a thread on rangefinderforum.com where the OP has experienced similar problems with either Portra or Ektar. If you read through the thread, you will see where he/she eventually mentions that the problems occured in film that spent several days in ambient temperatures in Death Valley - considerably hotter than 100F temperatures.
I feel for someone who ends up with film that has been damaged in transport or storage either at or after it was in the hands of the retailer, but I cannot see how a manufacturer who has no contractual or other relationship with the damaging party can do anything more than:
1) provide clear direction on proper handling; and
2) if it sees fit (as Kodak Alaris apparently has) to supply replacement film to the end user.
There seems to be a perception that film being damaged by environmental factors is a new thing. That just isn't the case. Historically, it was always a potential problem. The difference was that, historically and in major markets, if you purchased film from a Kodak dealer, most likely that film had been warehoused and shipped by Kodak to that dealer, and that dealer had a vested interest in maintaining its dealer status.
Sadly, that distribution system was only sustainable when volumes were high. Kodak and others now have no control over who is retailing their product.
There certainly were some exceptions - "Imported to USA" film comes to mind - but it was open to the customer to decide whether or not to accept that risk.
The reality is, if you buy film and have it shipped long distances, including accross borders, there is a small but real danger that it will suffer damage on the way.
It doesn't particularly matter what type of film it is, nor does it matter what brand it is.
It may be that a higher speed, T-grain film like TMY is more susceptible to this type of damage then others. Or it may be that it is just a matter of chance that a few unrelated cases of damage happen to have involved the same, highly popular film. or it may be there is a common factor that can be traced down, like a delivery truck break-down on its way to, for example, B & H's warehouse.
I have seen evidence here on APUG of a small number (less than 6?) of unfortunate people who have experienced this problem. There seems to be no consistent similarities between their experiences. There is similar evidence that a large number of people have had no problems with same film. That leads me to conclude that the problem isn't with the film its general distribution, but rather with other not yet identified commonality between the circumstances of those who have experienced those problems.