Do you mean bomb OR gusher? Usually a bomb means the bottle exploded. If it's a gusher that can settle down once the CO2 gets into solution.
Please forgive me if you have answered this already but...I made 2 gal. Hard cider(apple juice, sugar and wine yeast) fermented for 6 days then capped it and put it in my outside fridge. Drank one gal. And it was awesome, the other blew up in the fridge last night! What can I do to prevent this next time?