I had an echo that worked very well and a week or so later added an echo dot, which would not play music and or keep track of it's remote. I exchanged it thinking it was faulty and had the same issue. Tried connecting it to my cell service mi-fi device and it worked great. Borrowed a wireless router and it worked great, so I bought a new one. My old router was probably 6 years old, but was amazed that it fixed the problem. Tried changing setting in the old router but no luck.