Samsung Note 4 Unable to repair

1. Phone switches off randomly 5-6 times a day and can't switch on by the power button. The battery needs to be taken out and replaced before the device can restart.<br> I took the device in for service and they suggested a Software upgrade - which I did<br> 2. After software upgrade of R285.00 the problem still remained. I took it back again for service/repair and after doing a quality check and a Power diagnosis they told me it might be the battery that has expired.<br> 3. After buying a new battery of R400.00 the problem still occurs!! <br> 4. I went back AGAIN to get the problem fixed, and stood in the queue for over an HOUR even though I was the only one in that specific queue!!!!! <br> <br> I am expecting highly important business calls and can't afford to have my phone off.<br> Does Samsung even know how to fix their own devices?? Really!!!<br> At this stage I am very disappointed in Samsung because their customer service and problem solving skills are not up to standard!!<br> <br> Very sad!!<br>