Launcher keeps logging me out and uninstalling modpacks

[Andrew_PlaysMC]

So every once in a while after I am done playing Attack of the B-Team, I'll close Minecraft, close Technic, and turn my PC off. Then the next day, my account was logged off and when I login again, none of the modpacks are installed. This only happens once in a while. Does anyone know how to fix it???

Thanks,

-Andrew