Network Connections Not Responding

my server running windows server 2008 r2, , computers networked running windows xp.  worked fine until i changed internet providers.  began having problems networked computers disconnecting shared network files , not responding.  computers work fine approximately 9 hours, , hung , don't respond until computer re-booted.  (the server not re-booted.)  shared network files no longer disconnecting since turned off autodisconnect feature on server (autodisconnect:-1), computers still not responding after approximately 9 hours of working.  instructions diabling autodisconnect feature did not reference being changed on networked computers, server.  no error message logged when occur.

the internet service still available during time computers hung up, cannot because of computers not checked.

any suggestions appreciated.  since did not start until switched services, have been considering possibility of pre-set settings not matching, security issues time out @ time, etc.

while may bit premature, looks i've found solution problem.  apparently, ethernet connection has setting allows server turn off device save power.  can found on server/server manager/diagnostics/performance/device manager.  selected ethernet i'm using (the 1 listed) broadcom netxtreme ethernet , unchecked box says:  allow computer turn off device save power.  appears have fixed problem.  suggestions.

Windows Server  >  File Services and Storage