I’m on this site and on Landroverforums (for the Disco). I haven’t heard any such issues with a Nanocom. I think the one in question is probably quite rare.
On the other hand, I got the RSW EAS Unlock a couple of years before I got my Nano. The Nano is definitely easier to use, but so far, the RSW unit has done everything I’ve needed (I’m 5 1/2 years into my P38 now), so at 1/4 the price it’s really good value.