Z1 loud volume warning on bluetooth audio

[Rxms]

When the phone is connected to my car audio system, It generally works best (sound volume wise) with the volume on the handset turned almost all the way up, after about 20 mins i get a loud volume warning and the phone turns the volume down on itself so much so it makes bluetooth audio useless. I cant turn it backup on the phone while driving since its dangerous and illegal. (and incredibly infuriating) 

Im also having the same fault when paired with my soundbar.

It has only done it since the update to lollpop 5.1.1  (14.6.A.0.368)

Car head unit - Alpine IVE-W530ABT

Soundbar - SONY HT-CT80 

Is there a way to get around this?

[Uliwooly]

@Rxms

Do you experience the same while on safe mode ? what is the loud notification that you receive?

[ChopChop]

This is a "safety" thing so you don't damage your ears and sue the phone manufacturer for negligently allowing you to do what you want. I think it's a legal thing that phone manufacturers are advised to do now.

I will like to see what happens when someone, playing music in their car, crashes and get seriously injured because their phone suddenly decides at random that the volume is too high and turns it down. It happens to me randomly while driving (the phone turning down, not the crashing). I have my phone pluged into my car stereo through the headphone jacks. If I leave the phone volume down, then I have to crank up my stereo to a ridiculous level, which would damage my equipment. When the volume drops while driving, the natural reaction is to investigate the reason, taking my attention away from the road, and endangering everyone around me. But hey, at least my ears are safe!!

If someone from Sony is listening, another option in the accessories setting should be "car stereo" setting, so the volume remains where it began. As Rxms said, otherwise, it is dangerous, illegal, infuriating, and absolutely stupid.

I think the warning is as the attached image. Or something similar. Correct me if I am wrong.

[Rxms]

So i finally managed to get a screen shot....

This is the volume warning i get. this came up while being paired via bluetooth to a sony CMT-X5CDB personal audio system, 

I would understand if the warning came up with cabled audio out, cabled headphones or bluetooth headphones, but not with bluetooth car audio and hi fi systems, especially a sony device that it should recognise as not being a headphone type unit.

Anyone got an suggestions as to how we can get sony to look at this problem? 

[Rxms]

Sony support are saying its not meant to do that ans it may be a bug with the 5.1.1 update, they ahve asked me to do a reinstall of the update and see if ti fixes the proble, (i dont personly buy into the premise but i'l try anyways) i'l post the outcome.

[Amnesia1]

I have the same issue with the Z3.  Did no one do a risk assessment when they made it do this. What's worse being killed trying to turn it back up or going deaf!