If it is really just a wifi only issue (have you tested on ethernet?) .... then on a Hub3, you can try separating the SSID's of the 2.4 and 5 GHz wifi bands by renaming them in the settings and at the same time switch off "channel optimisation" apply and save the settings. All wifi devices will need reconnecting to the best SSID at each location.
Also use a wifi scanning App to find the best wifi channels to use (just select and use channels 1,6,11 on 2.4GHz) - this often helps Hub3 users get better wifi performance - but its still no substitute for getting better kit
🙂To address the wifi, VM now supply “wifi Pods” (not “boosters”). Pods are free to customers on 1GB or Ultimate Oomph packages - is that you?
If not you will be charged £5/month. Its a simple solution and should work for you. However, you would soon pay off that cost by buying a "better" wireless solution that will be yours to own and use forever but it isn’t the simple plug and play option of the Pod(s).
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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, 2 on WiFi) Hub5 in modem mode with Apple Airport Extreme Router +2 Airport Express's & TP-Link Archer C64 WAP. On Volt 350Mbps, Talk Anytime Phone, x2 Mobile SIM only iPhones.