Voicemail not saving

My voicemail has worked ok for years
then suddenly it has stopped saving the messages

I get no error messages in asterisk and the file appear in the tmp directory, but at the end of the call they dont get coppied to the INBOX directory

hope someone can help?

Still enough space an the /var/ partition?
Asterisk has still the rights to write to the directory with the voicemails?

Yes to both
I even deleted the directories and asterisk created new ones and you can see the files being generated in the tmp dir and then they get deleted at the end of the call but don’t appear in the INBOX