Fyi.. you are not the only one. I have the exact same issue with my ignite. I have an Onkyo avr and Samsung tv, tried different HDMI cables and all. But the only sure way that it works properly is a power off by pulling the plug. Frustrating that every other device works completely fine through this setup and the original Rogers next box did as well. This thread has helped, I will use the power down voice command.
If this is a known issue, Rogers should fix the problem. Im still having to unplug and replug each and every time I power down the system. I in the same as you, every other device connects fine through my receiver and comes alive when I power it up..except this rogers box. Not impressed with this ignite tv either...garbage. I may just do away with it and stick to my android box. So annoying to be honest. Never watch much of ignite...it sucks. Netflix, or android most times.