thanks for getting back to me. i have resolved the problem.Set the phones to high priority in QOS and gave 300mbs also. This appeared to resolve the issue. The Samsung A12 is only 2.5g not 5g. Also...

just received the 3 x s4 units . installed to my fiber network at 200mbs. on laptop connected via ethernet get 200+. using mobile phone using wifi ,stood next to main s4 only get 90. . Using wife...