My SG is going outa tune!?

so my epiphone sg is going out of tune. mainly the B and , and I'm wondering what i should do. I mean, yeah all guitars go outa tune, but i'd at least like to get through two songs on stage without having to stomp my tuning box. any one got any suggestions?? i have grover tuners, and i'm wondering if i should switch to a set of new gibson pearloid machine ones. what should i do??