Guernsey boss Jordan Reynolds accused his team of looking "uninterested" despite beating Colchester.
The Raiders scored tries through Sam Whitehead, Owen Thomas and Lewis Hillier in a 22-10 win.
"It was a comedy of errors constantly with missed tackles and dropped balls. We hit the panic button a little bit, which is a real shame," Reynolds said.
"It was probably some of the worst rugby we've played this year and we seemed to be on the back foot."
The victory was Guernsey's third in their last four matches and saw them consolidate seventh place in the National Three London table.
Despite that, Reynolds felt his side would have been punished had they been playing a better side.
"It's not like Colchester were throwing a lot at us, we just looked uninterested.
"If we played like that against any of the other teams that are sixth and above they would have put 40 points on us," he told BBC Guernsey.
"It was crazy, you can't miss 20-odd tackles in a game and expect to try and beat a top side.
"This is where we need to be ruthless. We had the opportunity to pick up a bonus point and we just kept on squandering opportunities, which was a real shame.
"We just don't have that killer instinct at the moment to send these teams off."