Dell XPS 15 :: Stuck On Logo And Boots For Hours Before Getting To Password Page

So i got this Dell xps  15 from the US through my uncle last year,  it is my first Dell, and i am at a loss at what to do, it was working great till a few months ago, it started freezing up at will, i couldn't browse or open files without it freezing, the process was  frustrating especially since i use it for work mostly. So i decided to format it and start over, issue is it still did the same thing, it kept shutting down at will and making my work process very slow, 4 days it froze while i was trying to  browse the internet on Mozilla it was frozen for about 30 mins b4 i decided to restart it, i pressed down the on button and it has refused load up properly since then, it takes hours to boot and even when i get to the password page and see my files my laptop still freezes up and i have to start the whole process again.