Hello, i have two Archer C3200 and they both block devices from seeing each other, be them both wireless or wireless to wired. Sometimes the routers randomly decides to allow a connection between two devices, tipically between the Sony TV and other devices (laptop, iPhone, Echo Show 5). But usually it blocks any protocol/packets between devices (even ping) - I've checked using Wireshark. I've been trying to change their configuration, with no success. Note: one router is in my home, the other is in my parents home, so they are not used on the same LAN. 
 

Do you have any idea about what is going on? Thanks.