Index Problems with Synology NAS


im new with Volumios. Just installed the latest Version and also i connected my NAS Folder ( I set all the NFS Permission like described) The mounting works well, also Volumio start indexing but suddenly after some minutes (The counter of Interprets and Albums and Playtimes goes up) it stops and all the counter went down to Zero. But the Indexing rotating Circle is still there. Its still ther after 3 Days and nothing to see. Any ideas ?!