[Samba] Win98se can't put big files to samba 2.2.1a

[root]

Hi,
I have a problem with my network. When i try to put files to my samba share 
the process stiops on win98 saying the share was unavailable or has been 
removed. 
I can't figure out what the problem is!

I can print. I can also put small file to about 20kb. But files bigger than 
that breake up.

Here is my config:

[global]
        workgroup = ARBEITSGRUPPE
        server string = Samba Server
        security = SHARE
        log file = /var/log/samba/%m.log
        max log size = 0
        socket options = iptos_lowdelay tcp_nodelay so_keepalive 
SO_SNDBUF=8192 SO_RCVBUF=8192
        os level = 65
        preferred master = True
        dns proxy = No
        wins support = Yes
        guest account = smbuser
        hosts allow = 192.168.1.
        printing = lprng

[public] the shared folder
        comment = Im Home Verzeichnis
        path = /home/public
        username = smbuser
        force user = smbuser
        read only = No
        write cache size = 50000000

as you can see I tried to improve by using write cache but it happens all the 
time. I can see on my Redhat 7.2 that the file is there bu it vanishes when i 
approve the error message in win98

Any ideas whats going wrong?

Thanks,

Jochen