Help!! Laptop Randomly shuts down

My laptop today has randomly shut down multiple times and I am unable to determine the problem. At first I thought it was the custom power plan setting that I made but even upon using the balanced one I found it shutting down. Then I thought it was due to my broswer (opera gx) because majority of times it only shut down only when I used multiple heavy tabs simultaneously for work but I couldn't pin on it so I removed my back panel to see if there was any short in any wirings causing the sudden shutdown but there were none. I removed the battery to check whether it was the battery's fault but solely using it on power cord also made it shutdown at same instances as before. I also ran it solely on battery without the power cord to see whether my charger was at fault but it didn't work and again the pc shut down. Currently every alternate or 3rd time that I start it after it shutsdown randomly, It works but I am skeptical. It has happened multiple times and I am extremely scared since I can't point why this is happening or what's causing it. I don't have a good local PC repair shop near me and the Acer store would over charge me for the simplest of things. If anyone can help me with this kindly do. I have an Acer aspire 7 (2020) Ryzen 5 gaming laptop.