Thank you soo much mohammed, this was fix my problemhey Guys, i've had had this prblem in my phone also and i spend alot of nights trying to figure it out why it does that... the solution to this is from Seetings > Accesibility > Power Button End Call
Make sure you unthick that option, otherwise while you're on a Phone Call and press the power button, dosen't matter if you activate loudspeaker or not, you'll end the phone call
Unfortunately, this dosen't fix my problem ...hey Guys, i've had had this problem in my phone also and i spent alot of nights trying to figure it out why it does that... the solution to this is from Seetings > Accesibility > Power Button End Call
Make sure you unthick that option, otherwise while you're on a Phone Call and press the power button, dosen't matter if you activate loudspeaker or not, you'll end the phone call