Samsung Galaxy S5 mini dies suddenly

I have a Samsung Galaxy S5 mini which is two months old. I have the following problem: The phone suddenly becomes unresponsive, the screen goes black and it does not give any signs of 'life'. Pushing any button does not do anything. Keeping the power button 7sec for the device to power off is not working. The only solution to 'revive' the device is to pull off the battery. While in this state, notifications, alarms, calls etc are not working. - I do not know if this is the right place to ask such a question, so sorry if I am out of topic. - This is NOT a duplicate of [Samsung Galaxy S5 died suddenly and without reason!](https://android.stackexchange.com/questions/85656/help-samsung-galaxy-s5-died-suddenly-and-without-reason)