Hi @BespokeFacialClinic
Welcome to the Sonos Community!
BespokeFacialClinic wrote:
The network seems to be working fine throughout the rest of our space and it shows full range on the app. One of the sonos is literally plugged in right next to our internet router and modem.
This is probably the problem - please keep any WiFi devices at least 1m away from the router (and the speaker). With them next to each other, they will be sources of interference for each other.
BespokeFacialClinic wrote:
The SONOS model is Sonos one, all plugged into power points, connected via bluetooth.
Sonos One does not support Bluetooth.
I hope this helps. If it does not, I recommend you get in touch with our technical support team who have tools at their disposal that will allow them to give you advice specific to your Sonos system and what it reports.