Moto Z3 won't connect at 300 Mbps with older routers (while Moto Z2 does)

I have a Moto Z2 that connects perfectly at 300 Mbps (5GHz) and 150 Mbps (2.4 GHz) with my older routers (Cisco, Netgear and Apple).

My brand new Moto Z3 isn't half as good: it won't go beyond 150 and 72, respectively.

With newer routers, the Z3 it will connect at 433 Mbps. It also connects at 433 Mbps with my Moto Z2.

The Z3 runs Android 8.1 and the Z2 runs Android 8.0.

Any idea?

Thank you so much.

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