dolphin does not want to work

[ElMonty]

hello
I need help
A few months ago I installed 4.0.2 dolphin and play well super smash bros brawl and melee
One day simply stopped working , the game runs at 50% maximum and its laggy
Only when I use the Direct3D11 and Intel HD Graphics runs well , before I could use OpenGL and NVIDIA GeForce but not anymore. I have proven with other versions , but not running
What do you think has happened? How I can fix it ?
Thank You

system:
NVidia GeForce GTX 870M
Core 2.80GHz i7-4810MQ
8GB RAM
Windows 8.1 x64

Traslated by Google

[Helios]

Try running the development versions.

[KHg8m3r]

In the Dolphin folder in My Documents, try deleting the Cache and Shader Cache fodlers.