My HTC One is about 18 months old. On almost every incoming call I receive, the loudspeaker turns on. Other than the fact you look like an idiot saying 'Hello' only to have your phone on the loudspeaker as if you don't know how to work the thing, it's actually pretty sore when you get a full blast 'HELLO' directly into your ear. I'm wondering if it's an Android issue or specifically an HTC One thing.
I honestly can't remember if it happened directly after an update, and I don't really have any odd apps, at least none I think would affect in-coming calls anyway.
This question is very similar to mine, but the apps which were un-installed to rectify the problem, are not and have never been on my device.
What is the possible reasons for this, and how to fix this?