Does IP address conflict or attempt by other devices to connect to a network indicate intrusion attempts?

Does IP address conflict or attempt by other devices to connect to a network indicate intrusion attempts?

I first received this message a few days ago:

"Another device is trying to connect to this network."

And then this message this morning:

"Windows has detected an IP address conflict. Another computer on this network has the same IP address as this computer. Contact your network administrator for help resolving this issue. More details are available in the Windows System event log."

I live at a type of hotel facility now, and their network used to be very good about 6 months ago. But it is different now, much slower. This is in Thailand, where they gradually are implementing the same type of Big Firewall of China as they have in China. Could it have something to do with that?

My Windows is Windows 7 Home Premium, 64-bit.

I have a mobile USB internet also, and when I switched to that after having slow internet on the fixed line and had received the message "Another device is trying to connect to this network" immediately the speed became much faster and I could browse as normal.