Defensive lapses left Hanover trailing at the interval by 2-0 against Moneyslane.
Hanover were hit by two goals inside the opening 15 minutes as the visitors to Brownstown Park took advantage of the hosts’ individual errors.
A third was conceded within the first minute of the second half.
“It was a terrible first half, with slack defending,” said Hanover’s Dean Crowe. “We were not good enough on the day.”