I have had a Sonos setup for many years now and have regularly had an issue with audio dropouts for my Play 5 (labelled ‘Downstairs’), which is the only speaker located on the lower floor - separated by a concrete slab from the upper floor. I have a boost in the ceiling space that is connected via ethernet cable to the modem. The upstairs speakers (three Play 1’s) all work without ever missing a beat! To try and resolve the dropouts with the Play 5 downstairs, I recently had an electrician run a cable down to the lower level and that connects to an old Bridge I had used previously (via a switch that is only used for Sonos devices). It then SHOULD be connecting wirelessly to the Play 5 over less than 10 metres distance and with line of sight. Despite this the Play 5 still is occasionally dropping out.
Here is what the network matrix is showing:
Any direction on what the issue might be and what to do would be greatly appreciated :)