I would suggest you to update the BIOS on the computer. Please enter your service tag # on the link below, then download the BIOS required onto the system and install it. [URL] Please let me know if this helps.  
As the title says, i bought this laptop in September 2021, works flawlessly and i used it everyday till november, after that i don't remember for how much time i didn't use it but it wasn't more than 7 or 8 days and then it just didn't start after opening the lid, i pressed the power button and that did not start it either then plugged it and it started without me even pressing the power button. This is the only problem that i am facing and i have been able to recreate it plenty of times, i am just scared.   
My inspiron 5510 needs to be plugged in if i don't use it for a few days