Best answer by AjTrek1
Most often than not what you are experiencing has to do with your Wi-Fi. It's quite possible that your router may be near another device that is causing interference. If possible try moving your router to another location away from any devices that produce any type of signal. There could also be others in your office using devices that interfere or if in an office building external devices elsewhere.
I suggest the following (Note: Doing so will change the current state of your Sonos negating the diagnostic you sent making it invalid if the problem is not resolved_worse case you'll have to re-submitt)
1. Unplug your Sonos speakers
2. Unplug any other wiresless and or wired components
3. Unplug you router and modem
4. Delete the Sonos app from the control device or devices if switching between them
5. Plug in your modem_allow it to come back
6. Plug in your router_allow it to come back
7. Install the Sonos App
8. Plug in your Sonos speakers starting with the one used to setup Wi-Fi
9. Plug in your other wireless and wired products
As you are in an office environment a Boost setup would probably be best: Here's the link: https://www.sonos.com/en-us/support/setting-up-sonos
Please post back with results. Cheers!