After a recent IOS upgrade to Cisco 3750's, appear to be experiencing intermittent LAN connection drops on IBM t43 laptops using the BroadCOM NetXtreme Gigabit Ethernet NIC's. Upgraded IOS to 12.2(35)se1 and ever since laptops will drop off the network. Only fix so far is to clear arp-cache on the 3750 and connection is restored immediately. Background: 2 3750's stacked and dual homed to 2 6509's. Able to ping from laptop to core 6509 (sw2) directly connected to 3750 the laptop is connected, but unable to ping other 6509(sw1)which has connection to 6509(sw2). No port security turned on, all speed/duplex is configured correctly, please help!!!