Minecraft with mods no longer works?

My problem is that I can no longer play Minecraft with mods on my laptop (not the worst), Minecraft itself starts but as soon as I start via Twitch launcher "Stoneblock or sky factory" he does something for 5 to 10 minutes and then he breaks off and doesn't say.

Why is it and how can I fix it?

First of all, you should add more RAM.

Otherwise, what's the mistake? What does it say