@MOO13 Just for the record . this issue will happen when you add so many deco to same main deco . i guess over than 30 . once i divided the network 2 different networks . 20 each . the old and the...

@TP-Link Thank you very much i will follow the email

@TP-Link Thanks for your reply . , the Cisco SG500-52P switch is working only as L2 Switch without DHCP , And only one VLAN . No routing done by the switch . the internet is provided using a Firewall...

@TP-Link i has 41 Deco units but i sent only the logs for the main deco and another slave deco . i am sending now the system logs .

@TP-Link Thanks for your reply i already stared a new thread under this URL https://community.tp-link.com/en/home/forum/topic/500426 PS: i didnot got any MSG from you . please send your email again...

@TP-Link Thanks for your reply and nice to meet you again . what exactly do you recommend? do you want me to rest all decos and then creat a network with only 20 units ? or deleting 21 deco units...