How to fix a problem with connecting a smartphone to the network?

Question

Computer networks

The problem is the following.
When connecting a samsung gt-55830i phone to a network via wifi, the following happens:
Some machines and / or servers and / or routers stop responding. for clients, mac addresses are replaced by the mac address of this phone. And the network falls.
How to deal with this? Never encountered this.

Answer 1

Similar to ARP-Spoofing
Tel. then probably rutted or cunning firmware downloaded from the Internet? Likely a virus.
Perhaps a hard reset / flashing to the drain will save the "giant of thought".