a simple bump shouldnt throw a scope off like . i would check over all the screws and mounts. if thats good then maybe send the scope back to the company for a look at. you could also have issues with fouling your barrel or pinch points in the stock that are working against you keeping a good group. did you have consistant groups all along? maybe shoot a couple and then give the scope a gentle bump with your hand. if it is thast bump sensative you need to have the scope fixed. also if you have another scope maybe mount that up and see if its the gun that has issues.