I have an issue when changing the channel on the C61K from 106 (4k60) or from DVR recording (4K60) to any 1080i or 720p channel.been reading about how buggy the C61K is over on the AVS forum. several people complaining about how when you try to change the channel from 106 to another channel it freezes up and you have to reboot. is this a common problem? or just a select few making a lot of noise? i was wanting to jump into the 4K scene but this gice me pause and makes me think i might be better off waiting.