Using a pair of Sonos Era 100

I reset the both the speakers and then in app created a new profile and its working fine. Thanks. But now the equalizer is disabled where I want to configure bass and terrible 

So under Settings → [Room] → Sound, the EQ line is greyed out?

Yes sir, but I think it's working now. I realized that the root cause of the whole problem was WiFi signals

That is very odd. I wonder whether you might download the Windows or Mac version of the Sonos app from https://support.sonos.com/en-gb/downloads and see if the EQ is accessible under Settings → [Room] there.

If it’s not, then the speakers may need to be turned off and on again at the wall.  

If it is, then it points to your iOS app which might need you to 

1. force close and reopen, and/or
2. log out and back in again, and/or,
3. uninstall and reinstall the app

Otherwise, I’ll hand this over to another learned forum member!

OK, after restarting the speakers equalizer worked, thanks. I brought the speakers closer and the frequency of sound disappearing on second paired speakers reduced. I think besides Wifi it has something do with the streaming channel that I am watching,  

Just to note, Sonos speakers when stereo paired do not connect to each other. You can stereo pair speakers that are in opposite ends of the house, if you so choose! Stereo pairing them just ensures they each get sent the respective L or R signals, via wifi. 

If one speaker in the pairing is dropping out, it could be that the wifi signal isn't reaching it well enough. In one of my rooms for example, I have two speakers stereo paired - but because of the layout of the room, one is closer to my Deco wifi node in the hallway and the other is closer to the wifi node in my living room. So (as evidenced in the Deco app) they get their music streams from different wifi nodes (but obviously still in sync). 

Is it possible the speaker that is dropping out has a weaker wifi signal whereas the other is better connected to wifi?

The left speaker that’s dropping out is slightly closer to the router compared to the speaker on my right. While setting up stereo pair its the right speaker that the application took as the main speaker and is used for connecting the devices using Bluetooth, which never drops voice. 

Whenever I start playing any streaming channel in my MacBook, the sound first comes in that right speaker and it takes a second for both speakers to start playing sound as stereo pair. 

Can you go to Settings → General Settings → About Your System, and scroll down to the details under each of your stereo speakers. Are the ‘Version’, ‘build’, and ‘Hardware version’ all saying the same numbers for both speakers? 

Sure I will do that once I get back home

Looks same except for the hardware version and color

Moderator Note: Removed Serial Number and Sonos ID. Modified in accordance with the Community Code of Conduct.