Need help! ac adapter Watt not enough or Game it self optimization problem??

Hello there!

I have one big problem with my AW 15 r3 (Specs: i7-7820HK 2.90ghz-16gb ram-1 ssd-1 hdd-GTX 1070 8gb) .

With Ac adapter 240w,here is the big problem:

1. Assassin Creed Odyssey:Very High Setting around 3-5 minutes,ac adapter switch off the blue light too,cause FPS drop and laptop shutdown and turn on back with the message (battery LOW).
2. Hybird power, i read and try several options (updated bios-switching thing on High Performance-All driver updated).
3. I tested with other games like Metro 2033 redux-Warframe-The Witcher 3 (all 3 with ultra setting). Completely normal,there is no ac adapter switch off,everything is normal.
4. I not fan of overclocking or cpu high performance so these options is OFF.
5. Normal temperature, fans working smoothly.
6. Attachment devices: Muose-Corsair RPG KB-Cooling fan-headphone.
7. I tried to disconnect attachment devices and run Assassin Creed Odyssey with same problem.
8. IM OUT OF WARRANTY.
9. On internet they are strongly recommend a new 330w adapter.

My question is:  240w ac adapter Watt not enough or Assassin Creed Odyssey it self optimization problem (look at 3 please)??

Do I have to buy a new 330w ? i meant for future video games,those game will absolutely heavy,so I have to buy a new 330w adapter right?

Im a big fan of RPG so this kind of problem is make me angry,This look like im holding AK47 and cant shoot.

Did somebody solved this problem or someone already bought 330w ac adapter,please leave a comment,did 330w solve this problem? (Look at 8 please).

Some photos below please take a look,THANK for your time.