[Need advice for my PS4]

please can someone give informed opinion or has nobody done this before ?

[Need advice for my PS4]

Hi guys , so my problem is that my 1 and a half year old ps4 is now starting to shut down randomly without any overheating warning 

I am thinking about a complete teardown and giving it a good clean and also replacing the thermal paste while at it 

Now what i want to know is if i do remove the warranty sticker from the back will Sony service center still do the replacement procedure of my console , has anybody tried it 

Any input will be very much appreciated