I have had my second Mio Cyclo 405 replaced now, Mio support claiming hardware fault, me doubting it. When my third Cclo 405 came arrived with the same fault, adding to that my old 315 having the same fault as well, I started poking around in the settings.
I eventually found under Settings -> System -> Alerts, if you scrolled down, a setting called “Auto Recording”. I have now tested this function and it is indeed the cause of my “problem”.
I have informed Mio support of their incompetence. It is one of the worst cases I have seen in a long time. Mio Support, their repair center and even their software engineers for the Cyclos, neither knew about this function! It is shocking.