Terribly designed

I returned a $35 unit for this one. My background: Satellite Communications Engineer, professional high-end home audio manufacturing. My problem? The unit will stop all output to speakers but not subs. For whatever reason, it will do this about twice a week and I have to restart my vehicle about 10-20 times before it will output to main speakers. I’m guessing it’s maybe a protection circuit, but it will sometimes heat up and sometimes won’t? Doesn’t make sense. Furthermore, I want to meet the people who designs consumer electronics. The next/previous track buttons are 2 of the most important, so why for the love of god are they some of the smallest buttons? They are hard to see, at the bottom, and tiny. I hate driving and changing tracks. Why is the back button bigger and easier to get to? Built in Spec Anny is useless, hard to navigate folders, menus, etc. Also, sometimes the track title displayed will not change when I go to another song. It will display that one song no matter the number of times changed.

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