I just had this problem crop up on my m8 and it just started today as I clearly remember using my phone yesterday and speakerphone was not coming on by itself. I hadn't touched any settings or installed any apps since but I was reminded of a time when I got a drop of water in the USB port of my s2 and it activated car mode and wouldn't turn off until I got it completely dry.
Long story short, I cleaned out the USB port AND headphone jack on my m8 and the problem instantly stopped. Hope this helps.
Long story short, I cleaned out the USB port AND headphone jack on my m8 and the problem instantly stopped. Hope this helps.
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