Radio/tape Cd Player problems of the 2014 Hyundai Elantra

Troubles with the power/battery. Troubles started around 80k miles. At first the battery was a suspicion. A new battery was bought and then we were told a specific battery was needed which we obtained and put into the car. I am unsure if the battery is the issue (at this point I don't think it is). Recently, the car at about 86k miles, has had times where it does not start. For example, times where we go to the store or even left overnight, the car will not turn on. No sign of life at all. We wait a while then try it again. After a while, the car eventually turns on but there is no telling how long it will take. There have been occasions where we are driving and the dash board lights will all turn on at once then turn off. Other times we will be driving and the radio/clock screen will randomly turn off and on as if the car was turned off. At this point we are worried we will be stranded if we take this car out into the community. The car has not turned on while at home, visiting out in the community, and at work. The lights on the dash and radio face acts up while driving. No check engine light has ever came on.

The sunglass holder on the ceiling repeatedly breaks and hangs down blocking the rear view mirror. Less than a year or 2 after I bought this car new, the clasp which holds the sunglass holder up broke. I've had it replaced 2 or 3 times now and it never lasts more than 6 months or a year before it starts falling again. It starts just falling when I hit a bump and then won't stay up at all. Now that my car is no longer covered by warranty, Hyundai is telling me it'll cost $420 to fix so we've kept it duct taped up so that we can see out the rear view mirror. This sometimes works in the winter, but in the florida heat, even the strongest gorilla tape melts and doesn't stay up for more than 5 minutes at a time.

I went into my car, which is parked in the garage, and turned the key. The car didn't turn over or make any type of sound indicating the car was starting. I did have radio and lights. I called a friend to ask if it could be the battery, my car is just 10 months old and only has about 5,000 miles on it, by the time I finished the call I tried to start the car again and it turned over. This happened again the following wed. I took the car to the dealer and the "tested everything" and came to the conclusion that it was battery related. That because of the extreme cold and not using the car very much it was causing this to happen. But if it is the battery, why would the car start up a minute or two after it did not? I have never felt safe driving this car and now this problem is only making it worse.