Volume Issues - Too Loud & Too Soft

Question

This is a problem I've had for awhile now. It's getting unbearably frustrating. Volume issues, where the default value for sound ranges outside what the iPhone should be capable of doing. So for example if the volume goes from 0% to 100%, my phone will be completely random and range from -50% to 150%.
How can it be less then 0% you might ask, when moving the slider mid way the volume is completely off and any lower doesn't make a difference, then I'll receive an email notification and BAM the volume goes up 300% and it's so loud it feels like the speaker is going to explode. This problem happens at any time but mostly after or while using headphones or car bluetooth.
Example of my issue in action, I'll plug AUX in the car into the phone, play music, driving along, randomly goes to half volume. I'll turn up the stereo to compensate, one minute later I'll get an email and the volume resumes to normal operating volume and I almost sh** my pants in fright.
Another example is I'll be watching a video late at night before bed on youtube or something with the volume all the way down, then the next morning my phone alarm will not sound or it will but insanely softly. The work around for this is to play music right before locking my phone with the volume up all the way. Just move the volume up all the way, play > pause and there you have it, volume working agian.
And one last example, randomly it goes really really loud. Like how is this possible loud. I'll dial a number and when pressing the buttons instead of a beep beep beep. I get fog horn BEEEEEEP BEEEEP BEEEEP. But as soon as the call starts the volume sets itself back to normal. Kind of like how when playing music without head phones with volume on max sets it back to normal.
Things you should note:
Ringer volume has been locked to maximum, but quite often won't abide by this rule.
I've reset the phone and setup as new iPhone, problem still occurs.
Please don't give a solution like, "Have you checked your sound volume in settings". I'm not stupid.
Also, please don't give a solution unless you understand the difference between "Notification and Tone Volume" and "Media Volume".
Other then that. Please help, this is driving me mental.

Answer 1

I recently did the last firmware upgrade for my ipod nano 5th gen and can't set the maximim limit.
It can be set, but wont stick and I can still go above the limit.
Did something break with the firmware upgrade.