Yes, mine comes on seemingly at random; I can however disengage Shuffle mode straightaway when I notice….I haven’t been able to find a setting that stops Shuffle coming on at random though - which is a bit annoying - but your issue seems more problematic.
I had this annoying problem about a month ago but it seemed to resolve itself after a couple of days. Somewhat naively, I assumed Naim had applied a fix to the app. However, the issue has returned this weekend and now, after some online research, I’ve discovered that this issue has been ongoing (off and on) for a number of years! Come on Naim, extract the digit and get it finally sorted once and for all.