Try unplugging both speakers from power for about a minute.

Is this your home office or at work?

This is my home office and I have unplugged them several times. That does resolve the issue, but it continues to revert back to the previous issue. This has been occurring for probably 9 months. 

Are you able to connect one of the speakers directly to the router with an ethernet cable?

No, I am not, but I have a mesh router 5’ from the Sonos speaker that has issues. 

What router are you using?

You might consider getting a Sonos Boost.

Google mesh router, in my mind there really isn’t a reason this shouldn’t work. 

You could be experiencing some wireless interference:
https://support.sonos.com/s/article/3286?language=en_US

Just for testing purposes, I would try moving your pair of speakers to another room just to see if you experience the same problem.

Unfortunately this really didn’t help. I have even repositioned the speakers in my office to avoid potential interference.