Piece of advice: If you truly are detecting an attack, why not supply me with the attacker's MAC or IP address so I can verify that the device is unknown and not perhaps a known device that is infected.
Also, since I use Norton on my PC and two laptops and neither of them seem to think my network is under attack, I have to wonder if norton mobile is nothing but adware. Meanwhile my router itself shows no additional devices connected nor does the Android app 'Fing'. Of course my only options are to buy norton's wifi security or switch networks. An attacker is attempting to decrypt this network and may view or alter your communications' 'This network is compromised by an unknown third party. I just recently received an update to my Galaxy S8, I think to Android 8.0 and immediately after got a notification that both my 5ghz and 2.4ghz networks are under: