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Hardware Version : Not Clear

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ISP :

Hello, I recently purchased an AC750 Archer D20 dual band modem router to replace the modem my isp supplies because I wanted better range and dualband capabilities. My contract is for 10mbps and with my old modem that is the speed I get. Once I installed the AC750 I am only getting 5mbps, doesn't matter if it's wired or wireless or on celular or pc, speed is a constant 5mbps. I reconnected my old modem and I once again get the correct 10mbps speed, go back to the AC750 and only get 5mbps. Is this a matter of me not configuring something or is this a defective modem?

Any help is greatly appreciated.

Thanks
Ramon