Blade Stealth 13 (early 2019) will not switch on

Hi, my first post here! yay.... I have the following issue: I recently bought a Blade Stealth 13. I am quite happy with it besides my switching on issue. Out of nowhere, it started to not switch on anymore. I have checked the battery and the charger but no sign of malfunction. This "not switching on" anymore arises when it goes into a sleep mode or when I shut it down properly. Afterwards, the laptop appears as dead. I then have to press and hold the power button until I see the white light flash. Yet, the battery is fine and the charger is plugged in, holding the power button does nothing than flashing the white light (not always too). Occasionally, it will change to a green light, indicating that it is on. However, besides the green light and maybe a flashy keyboard nothing else will happen. The display will remain black. If I continue and hold and press the power button several times it will randomly switch on. This may take 5 minutes or 1h. I have not determined which sequence of events may help. So, I checked if maybe the BIOS is not up to date, and indeed it seems outdated (Razer 1.02, 09.01.2019). I then tried to update it, but without success, although I made sure I have the correct one click updater file. That's why I am here now. Anyone else having this trouble? Any tips on how to update the BIOS? Any other things I should try? Cheers, Hagen