I hate to break it to you, but the time that fix will last varies on each system. A friend of mine had the same problem, so I performed a similar fix, only to have him report two weeks later that it stopped working again. I was a little more rigorous in the fix and I found that does seem to make a bigger difference, but no matter how many times you try it, the problem will never go away.
The only long term solution to this problem is to perform this once again, never turn off the system, and hope for the best. Unfortunately the longest I've heard this method lasts ranges between 3-5 months.
If you do decide to do something like this, you can try my method:
1. I prefer to set my heat gun to high and give 10 seconds to the memory and 15 seconds to the CPU and GPU.
2. Let the board sit for no less than 15 minutes to give it time to cool, and do the same process to the other side of the board at the same approximate locations.
The PS4 unfortunately does not accept any PS3 games and has a terrible selection of Local Multiplayer games so if you are like me, dishing out ~$150 for a replacement system and waiting until game developers come out with game worth playing is not that terrible. Sony did announce support of the PS3 for the next two years, so you will see new titles like destiny for the PS3.