At my (previous) company we’re using Synology Cloud Station with 20 users and lots of files. One user was complaining that the folder names were renamed with this nice addition:
Company Name B.V._PC_Name_UserName_Jan-27-145750-2015_TailCharacterConflict
Everything I tried didn’t help: renaming the folder, deleting it from the server, resyncing, everything. Google wasn’t a big help either. The folder kept being renamed with this very irritating TailCharacterConflict.
Until I saw the pattern.
You CAN’T let you folder name end with a trailing PERIOD. In this case, the folder name was Company Name B.V.
Changing the folder name to Company Name BV (with the periods) solved the problem. Insane, but true!