Strange LU2 Error

["Pearson, Darran" <dpearson@xxxxxxxxxxxxxx>]

I am having a strange login error that seems random.
 
When getting into our ERP JBA System21 Classic I get following error.
 
LU2 Emulator Error
Communications error detected in session number 1
QueryComms Status Failed 2(-5)
 
I click help and it gives me following message:
 
CHP Error-1010 CHPAddrInUse
The IP address of the PC is already in use
 
I sometimes can fix with a hard reboot of PC or resetting TCP/IP stack
twice but now that doesn't work anymore.
 
Try using just IBM Personal Communications Emulator and get a socket
error in the trace. Socket rejected by server.
 
This problem just started up out of the blue, nothing changed.
 
AS/400 is low on disc space. 92%
 
Any suggestions?
 
Thanks in advance for your kindly assistance.
 
Darran Pearson