Macbook Air hanged while on Safari

hi, i have bought my macbook air at the start of this year, no problems encountered until now. Sometimes while im watching youtube videos, macbook would freeze, only the audio going. The cursor wont move, the youtube video will freeze but only the audio will keep going. I tried the force quit buttons (command-alt-esc) or (cmd-control-esc) or any other combinations, im just saying nth works. I will have to press my power button then to restart the laptop completely. only then, it would return to normal. Any ideas? Any solutions for that?

P.S. I do not wish to continue restarting my mac every time it happens as this would likely affect the longevity in my opinion.