Console Overheats? Shutting off without warning

Good afternoon guys!

My PS4 Slim One day just didnt turned on! I tried everything Basic like removing The cables and waiting and everything else but nothing helped.

The shutting down process is abrupt, almost like the power went off.

For the next step i removed the HDD and the console worked! It gave the warning that it needed the hdd to work, i putted back in but after booting up the console turned herself off in mere seconds.

A consistent issue is that after the console justs down (being hot or not) i cant Turn her back on right away..i need to wait a few hours! For her to boot again.

After a few days of trying various things i opened the console, cleaned it and changed the thermal paste.

After all was done it finally worked! I played for 5 hours The first day with no issue whatsoever..turning it back on and off without a care…but well it didnt Last.

The next day i played for 2 hours and i shutted off the console ..after i went back i played for 20 mins and the console shut herself off…and the process of not turning back on again started again.

Soo this is the basic off it…looks like the console shutting down its not a overheating problem since The console doesnt do The normal overheating process of shutting down…but at the other hand changing the thermal paste allowed me to play for a couple os hours with no Issues….i just dont know what 2 think.