996 radio key no longer works once???WHY???

Hello dear Porsche community, I’ve been having a problem for 3-5 days now, my radio key from today to tomorrow doesn’t open the doors anymore… First thought the battery from the radio key would probably be all… Habs changed and thought it would have to work out now. Unfortunately, what can’t be the reason that it suddenly doesn’t work anymore??? Can it have something to do with the increasing coldness… Because since the snow here in Cologne I have the feeling that it has something to do with it… Since a few days I have had to close the doors or manually.. And sometimes the key doesn’t turn either.. At the cold, I guess at some point the door lock would be very connected to a few tips Thank me in advance and stay with LG. Care1805