What exactly do you mean by “losing connection”? Is the Era 100 grouped with the Beam? What exactly are you playing from the Beam?

Hi yes era 100 is grouped with the beam , and I am watching tv using the Arc , and the Era stops working for a few seconds.

It is generally not recommended to group speakers when playing TV audio because you can experience frequent dropouts and a slight audio delay from the grouped speakers.

Are you able to wire the Beam or the Era 100 directly to the router with an ethernet cable?

I don’t think the OP means grouped, I think they mean bonded, as one of the original ‘tags’ is ‘rear surrounds’.

My suspicion is some sort of wifi interference .