Signa 2 Soundbar audio bouncing between TV and soundbar

I just bought the Signa 2 Soundbar, connected to my Hisense Smart tv via the ARC HDMI port.

When powering on the TV, and when changing sources to other devices connected on HDMI, the audio "bounces" between coming out of the soundbar and the TV speakers. This usually happens for a minute or so before the sound starts coming out of the sound bar.

This is very annoying, is there anything I can do to fix this and make it come out of the sound bar straight away?

Thanks

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