Maybe it's not compatible? Do you get any advice/solution from tplink support?

Try downgrade firmware. Contact tplink support for further help.

Wow, 150 is a lot...you would need business router I think

We cannot set two networks on one router. Even there is two different bands, or guest network, it's not working like a repeater.

I don't see tplink router can do that.

They will fix bugs in any on that particular hardware version. For new hardware version, sometimes no much difference, maybe they use a different chipset, a new user interface, or add some new...