Strange files appear in NAS

[raziel-]

Adding this because it's really annoying, but i don't know if it's harmful.

Every once in a while there are strange files appearing in my NAS root (I have a Synology DS120j)

The first file that will appear is an empty one named:
1zzzzzzzzzzzzzzzz... (where the "z" char is going on forever, exceeding both the Amiga and Windows FS name limit)
I can delete the file (sometimes it tells me it's locked, but some time later the lock is gone), bit can NOT copy it (due to it's name size, i assume.

If i keep the file then, after some time, another file appears, also empty, this time named:
2yzzzzzzzzzzzzzz... (where the "z" char will also go on forever, jut like with the above)

I haven't tried to keep both files to see if a third one (probably called 3xxxxxxxx) will appear.

Since this only happened (for now) with both the Synology and the FritzBox NAS, but never so far with a Windows share, i'm hesitant to blame smbfs.

But maybe you got some insight on where these files come from, what they are supposed to do and how i could prevent them from appearing in the future.

I didn't catch their creation yet. I'm assuming from their time stamp (6:19 am) that it might have to do with the NAS coming back from sleep (the NAS is forced to go to sleep after 1 hour of idling and will be woken up when the network comes back to life at 6 am).

Thank you

edit: Acually the second created file will be called 2yzzzzzzzz...

[raziel-]

So, i just found the same files on my windows share.

I guess it does come from smbfs?