Try moving it closer. Start with it in the same room and then walk it out until the connection is lost - then move back a bit.
Wall could be an issue - especially if it is a thick stone one, a Victorian iron rich red brick one or a modern plasterboard wall with inbuilt tinfoil insulation, etc.
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John
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I do not work for VM. My services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired, 1 WiFi, 1 on PA) Hub5 in modem mode with Apple Airport Extreme Router +2 Airport Express's. On 250Mbps, Talk Anytime Phone, x2 Mobile SIM only iPhones.
