@Gorgia Thanks for your reply Alexandre Signal show two out of three lines. That's strange since the master and slave devices see each other and are separeted by no more than 10 meters. There are no...

Master P7 is connected directly to router (1Gb) via lan cable. Slave P7 is at ten meters from master. Cable connected to master speed is 900 Mb (good!). Wifi connected to master speed is 550 Mb (less...