Got it @Frankafloat, certainly sounds like there’s some local WiFI interference, especially as the issue is location-specific.
Very odd that this only affects Spotify however… at this point I’d recommend reaching out to our Support Team via either live chat or phone call, as they will be able to perform some more in-depth, and live troubleshooting with you.
I did notice that you mentioned you’re using a BT HomeHub 4 as your connection to the internet, with an Orbi mesh serving as your router - while you’ve disabled DHCP and the Wireless radio on the BT HomeHub 4, I don’t believe these routers can be set to Bridge Mode, so it’s possible that this is a very strange effect of Double NAT - this may be worth considering if there are no signs of interference when getting in touch with the support team.
In this case I would recommend reaching out to BT directly, as they should be able to assist you in getting the Orbi connected directly to the internet - bypassing the HomeHub 4 entirely.