Home theater connection and source question.

I brought a VIZIO - M-Series - 55" Class (54-5/8" Diag.) - LED - 1080p - 240Hz - Smart - 3D - HDTV 3 months ago, brought this sound bar a week later and connected the sound bar and it works. I followed the instructions connecting it from the Comcast cable box HDMI into the sound bar, and out the sound bar into the TV HDMI. Since its a smart TV with apps, the only way I could figure out how to play movies through the apps or PS4 is to use a yellow audio cord and switch to AUX source. Now randomly, the sub woofer doesn't want to connect. It occasionally disconnects on its own and the few times it did all I did was turn it off and turn it back on. All I have been getting is the blue light blinking for the last week. I follow the instructions the best way I can understand by resetting it but all it ever does is the blue light stops blinking for 5 seconds, red light comes on and back to it blinking again. So the questions I have are
1.) Can I use the sound bar without having to change sources to do everything and getting the sound bar to come on when the TV comes one because I currently have to turn all three items on using single remotes for all three.
2.) How to fix the sub woofer issue, since its been a few months, I don't know if I can call geek squad and they help me trouble shoot it and if it is a problem with the item, does it have a manufactures warranty?