Just got the KD55X8509C and connected it to the CT380 soundbar using HDMI(ARC). All was working fine, with soundbar switching on as soon as TV was switched on. However, last two days, the soundbar doesn't switch on straight away. There is a 15 second delay before it switches on. Has anybody else experienced this problem and if so, can it be resolved?

I have done the usual, reset soundbar, TV and disconnect and reconnect, but still having the same problem.