I just looked at this product it online. I didn't say anything before because I thought that it was one of those films for printing, so couldn't answer as the ink adds a new variable. That stuff is brand new for me and I thank Diane for anything I am learning in that field!
These polyurethane films like your Spectra Eco, Thermoflex Plus, and Siser Easy Weed as well as the old stand-by Thermo Film and its vinyl cousins, seem to last indefinitely for me as well. These are not your father's "iron-ons! (well maybe, your father's but not mine, lol!
As I tell my customers, it's not like I have never had a problem, but these problems tend to show themselves right away, and of course, indicate a screw-up in one of the variables of time, pressure, and temperature, assuming that the garment was dry and not contaminated with anything.
btw, I presently like Siser Easy Weed, but really like the attitude and support from Specialty Materials.They were freakn' great!
Even went and did some specific testing of stacking compatibility of certain films Thermo-Flex, washed them, and got back to me an hour later!