I had the same problem. Tv is Samsung h7100 and just got the ms650 soundbar. I was messing around with it for 2 days until i found a solution. It had to do with my router. I found a post somewhere on line that the sound bar tries to connect to wifi using 2.4GHz and it needs to connect via 5.0GHz. I am no expert so this may not make sense but it connects everytime now with the multiroom app. I had to go into my router settings and dissable the 2.4GHz channel. Once I did this it connected to wifi no problem. I then went back into the router settings and re enabled the 2.4GHz channel because other things connect to it I guess. It now connects and there are no problems. I hope this helps someone.
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