Zenfone 6 died after a few minutes of game play (clash royal).

My Zenfone 6 (ZS630KL) died after a few minutes of game play (clash royal).
I had my phone charged till 63/68 procent and that took it out (I do not leave it in over night) , after 15 min I checked a message try to phoned someone and than maybe 30 min later I wanted to play a last game of clash royal before bedtime. Before the play even started my phone went soft lighted dark blue and after a while I started to press the on/of buttom. The logo came online and went out again. This went on for maybe 2 or 3 times and afterwards it did not do anything anymore. I tried to use 2 different kinds of chargers, but the phone stays completally dark without any kind of response to anything.
I have the feeling that something should have gone wrong with the motherboard??
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@suzanne11tijink If your device is completely unresponsive, then please reach out to a local ASUS service center and/or your reseller, as your phone most likely will require service.
I will look one up! thank you:)