An OEM would issue a field safety notice for all users.
Please! You report consistent/repeatable faults to manufacturers and the standard response is 'You're the only ones to experience this'.
I can get a well known manufacturers defib to completely lockup and be unusable while displaying a ready for use indicator (you have to remove the AC power and batteries to get it to respond!) by doing something that a member of staff could do easily - I reported it to the manufacturer and after several months the response was 'You're not using it according to the instructions'! - Sorry, but you give me a piece of equipment and a nurse and I give you Murphy's Law...
Manufacturers don't give a monkeys once they've had your money and the MHRA are (tooth/use)less - but this is not a debate for this particular thread.