I beleive you have one of 2 problems.<br><br>1) The frame relay links are being overwhelmed at some point<br>2) (outside posability) Your clients are using IPX with SAP<br><br>If #1 is the issue (assuming a IP only network) you are<br>overwhelming your frame relay CIR (comited information rate)<br>some how. Here are some possabilitys....<br>A)routing protocol (eigrp, ospf, etc) is going through <br> periodic update 'storms' utilizing all available<br> bandwidth until the routers converge (settle down)<br> causing short periods of blackouts for users.<br>B)You need more bandwidth on your FR links because normal<br> user traffic is exceeding link speeds.<br>C) You are using more than one protocol over the links.<br> If you run other protocols besides TCP/IP, such as IPX<br> and Appletalk, try to eliminate the extras and just use<br> TCP/IP (expecialy get rid of the appletalk!)<br> This will leave more available bandwidth for users.<br>D) You need to take a look at what the routers stats say<br> to get help determining where the bottleneck is.<br> Assuming you use Cisco routers, do ....<br> show buffers<br> show interfaces<br> show processes cpu (to see if cpu utiliz is high when it happens)<br> show ip interfaces<br> Look for clues in these readouts<br><br>If you use IPX on your WAN links, you can do some magic to<br>keep IPX and still cut down IPX traffic. But that is more<br>involved subject.<br><br>Leroy Harvey CCNA, CCDA, MCSE, MCNE