ARP Cache Poisoning from my cell phone?

Good afternoon all.  Quick question about the ARP cache poisoning message.  I'm now getting this message and after checking the MAC, it's my cell phone.  Just started getting this message yesterday after doing a software update on my phone (coincidence?)  Had my phone for a few weeks now and the messages just started.

 

I guess my questions are, is this anything to worry about?  Should I leave my wifi off on my phone?  Is this something I can clear off my phone?  I realize its blocked on the Mac but should I worry about other computers on my network?  

 

Also, my Norton for Mac is expired.  Why would I still be getting these messages?  

 

Thanks in advance for your time and I look forward to your response.