I have a home network consisting of

• Cable DSL Model / router
• TPlink Deco (M4's / M5s) configured using ethernet backhaul
• 6 rooms connected via Cat 6  terminating on unmanaged Gigabait Switches (also tplink)

Recently I added a new room to the network running Cat6 cable to the garden and adding another unmanaged Gigabit switch and an M5

Problem:

I am now seeing some devices (phones/laptops) unable to get a DHCP lease from the Deco network. Configuring a static IP works.

All devices have 1.6 Firmware

Questions:

• Is this a known issue?  Any quick fixes?
• If I don't use any advanced features should I move the deco to AP mode and use my Cable Modem's DHCP?

Any other tips or guidance?