Gta 5 still image?

I installed gta v today and wanted to play it. I also have very good fps but after about 15 minutes I get a still image. I guess it is due to ram or memory. How can you fix the problem? (Games on a laptop)

1.ram and RAM is the same 2. It may be that your laptop is too old 3. What do you have for a CPU at all? And what kind of graphics?

I have an i7 3630QM 2.40ghz and an NVIDIA geforce GT 650M