HTS 10 - Flashing red light

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Hi all, I am having issues with my new HTS 10. Just after I turn on my system and I try watching something in 5.1 the sub's led will start flashing red and will not work, I then have to power cycle it twice (I think) before it seems to work correctly. It seems to be fine for the rest of the session. This seems to happen every time.
I'm using the LFE connection and I'm not using direct DC.

I would love to know if the sub is faulty or there is something that I am doing wrong! Cheers.