Ok, today I got my 128 GB version of the Transcend 1000x.
Didn´t use Autoformat yet because I don´t know which option to choose from (optimised format, no option ticked, complete format).
So far I´ve had no single recording that´s been stopped - but it seems tight at first glance: It starts with around 1 or 2 ms idle and goes up, when the card warms up.