Intention to finalize a rear USB port issue (drives USB 3.0)

I’ve recently switched to the US model of the SMP (updated to 1.13.18) and so I thought I’d test the rear port with USB3 drives again. I borrowed the one that worked fine last time on my EU SMP, a

airy by CNmemory 2.5" enclosing a 1 TB Seagate drive ST1000LM 024 HN-M101MBB

and additionally a

Verbatim 2.5" 53018 enclosing a 1 TB Toshiba MK1059GSM.

Attached to the back port by a thick 20 cm cable, playing the CNMemory drive worked flawlessly over the course of a movie night. However, the Verbatim drive suddenly disconnected at ~2 hours into the movie night. Gonna try the Verbatim on the front port tonight to see if it makes a difference.