I wish that I had a solution for you but alas I only have an "me too". I have the same TV/Soundbar combo and this problem has plagued me since the beginning. I have sent the soundbar in twice for service per Samsungs recommendation and it has returned untouched both times.
I think that the TV is at fault. The previous firmware (19**?) almost worked flawlessly. No audio drop outs and the connection between TV and soundbar only seemed to happen once a month. Since after 2303 it happens every other day. Forcing me to power cycle.
Horrible experience so far.