It’s almost certain that all cards being renewed at the moment because they are 5 years old won’t work on their last day, it is a problem with cards issued before 26th August 2006 and there is no need to contact DVLA about it. Simply do what you would do with any malfunctioning card and take a printout at the start and end of the shift. Sign and print your name on the printouts and add either your driving licence or digi card number.