iPhone no service 'antenna broken?'

Hey guys! Basically I replace the lid on my iPhone 5c and for a week it worked fine, but then after a week I dropped it, everything seemed fine but it said no service! I did some research and its most likely the antenna connection! To prove that it might be the antenna connection every time I drop it I goes to 'no service' before swiftly reverting back to having signal again! What can I do to permanently fix it, as from my inspection the antenna connector looks to be in place I THINK