I think both of your reasons for not liking the car are legitimate. Honda has some of the worst electronics in the industry, cheap junk made by Pioneer, and the CVT is no joy to drive for an enthusiast. I have a 2014 Accord with a manual transmission and the least expensive audio system so I'll keep it for a while. But my cell phone which pairs with everything else I have tried, Camry, Prius, Nissan Frontier, and two Garmins absolutely won't pair with the Accord. The dealer won't help and says "they are all like that".
I would start by looking on KBB, Edmunds, Black Book, etc and get a very good idea of what your car is worth both for private sale and trade in. Then decide if the extra money you would get for a private sale is worth the hassle. Trying to sell a car you may meet some very undesirable people, people who want you to finance the sale because their credit is so bad they can't get a loan, people who will abuse the car on a test drive, etc. If you decide to sell it yourself you can find some good advice if you do a search. Such as don't invite the buyer to your house, meet in a public place, take a friend along, etc. On the other hand if you trade it in you will avoid those hassles but it will cost you a few thousand dollars to do so. I usually just bite the bullet and trade but I will go to as many dealers as I can looking for the best deal. Good luck.