I am a paying user and PS keeps crashing saying "trial has ended"

Hi There, does anyone know what this is about. I open up PS and other apps in CC which I pay £49 apx each month for, and it gives me a message saying "trial has ended" but I've been paying to use it for months now. I'm hoping this is a common thing and it could be to do with an update or something. Any help much appreciated. TIA 🙂