Helo,
before start the question excuse my english i'll try to not make many faults. Before open this thread i searched trough the forum and didn't find a similar problem.
In my house there's 3 pc's with windows and 1 Imac with OsX 10.11.3.
I have some folders where all can write and modify but sometimes the users with less power (can't access to all the shares that i have) can't write on that folders. To solve that i need to go again to ACL and apply again the permisssion to folders and subfolders (in the gui appear all OK but i need to apply again the permissions).
With OSX lost the server connection after coming out from hibernate (with windows that never happen), maybe can be related?