R129 Help Deck doesn’t want to open !!

Hello together, I have read a lot about this here but actually everything other signs than my soft – cover (Bj 91 – 300 24V)!! I can open the windows manually but in connection with the cover open these do not go down. Roll-over iron can be operated by switch and also works. If I want to open the cover I hear a slight cracking from the back as if it can ́t / can ́t ?? When I go with the button close but I notice that the cover is pulled right down at the front of the disc at the top. Had noticed in the last days that if I can ́t open the right window with the open cover can ́t close anymore. This went then quite normal again when the cover was closed 🙁 And since today the cover unfortunately doesn ́t want to open anymore !! Would I be very happy about tips and tricks. Greeting from Aalen KK