Hi, It sounds like there is another device on the network with the same IP address. Do you have systems that are DHCP? Try changing the IP address and see if that resolves it. This can cause performance issues. 
Hii All I have a problem with my Dell Powerconnect N3024 first, last week my VLAN2 gateway in my coreswitch was cannot access(192.168.2.5) , so i remove the VLAN gateway because all user and distribution switch in VLAN2 cannot make a connection to the coreswitch, then i was created a new VLAN2 but i cannot use the same ip address before, so i change it to new on (192.168.2.245). then the problem was solve, the user and the distribution can access the coreswitch, but when i check the log from coreswitch today, there is an error it says " Address conflict detected for IP: 192.168.2.245. Conflicting Host MAC: f8:b1:56:5a:d8:85" "IP address conflict on interface Vl2 for IP address 192.168.2.245. Conflicting host MAC address is f8:b1:56:5a:d8:85."  anyone can help??is it had a correlation with slowly access in my network??  nb: here the full log capture [IMAGE]
Dell Powerconnect Conflicted Ip Address & Mac Address