Connection termination by a remote site. USB Modem UM175 HELP!!

I am having a problematic issue with connection termination with a USB Modem UM175. I am using this USB modem on a MacBook Leopard. The connection won't stay connected longer than 5 maybe 8 minutes at a time before giving me this error message, "The connection was terminated by a remote site. Please try again." Any suggestions?  Verizon first said that it was an IP address conflict and the Verizon software wasn't updated. Both were looked into by a Mac guru and still the problem persists.  Mac people nor Verizon people can seem to figure out what it is. I am so fed up with the constant interruption but have limited options in the area. 


Any suggestions would be helpful at this point. Thank you!