When i answer calls, sometimes the loud speaker is directly on and everybody can unexpectedly hear my interlocutor very loudly. I didn’t get why. It seems to be completely random. But the loud speaker button is not activated on my screen. So i have to push it twice to inactivate it.
And recently sometimes when it happens and i want to switch the loud speaker off, my screen remains black, impossible to do anything to switch it off… Very embarrassing sometimes.
I assume it may be a contacting issue of the corresponding (sound)module.
But I am not sure.
There is another user who opened this tread “Mic stops working switching from speaker phone”. It also could have the same cause.
There are FP2 users facing contacting troubles. But that is only my assumption considering your description.
The other could not solve his problem by replacing a module.
It is tricky indeed.
No, not this. I think if it was so elemental even more users would face this problem, but my phone works just fine. Anyway I do believe that there is an eye-catching variation in manufacturing quality of FP2.
If there is no obvious cause found also with help of the support, you can still do a factory reset before sending it back at last.
Unfortunately I am sorry to say that I am out of ideas now. Anyway I hope the support has a easy solution beside replacing the complete phone.