Pinchbeck United are bottom of the United Counties League Premier Division North after four defeats in a row, three without scoring.
They thought they had broken their duck when Andre Williams put the ball in the net just before half-time at Boston Town. However, it was disallowed for offside and the hosts went straight up the other end to go one up.
Boston added three more after the break.
Knights: Lakin, Wright, Gagyi, N Stevens, Jaine, Sheriff (Kudla), Tate, Melson, H Johnson, Ibeneme (B Johnson), Williams. Subs (not used): Stuffins, Edwards.
Attendance: 105.
The Knights also trailed 1-0 at the interval at Skegness Town last Wednesday. This time they conceded two more to go down 3-0.
Knights: Edwards, Kudla, Gagyi, N Stevens, Stuffins, Sheriff, Tate, Melson, B Johnson, Ibeneme, Williams. Subs (all used): Garner, H Johnson, C Stevens, Turunen.
Attendance: 129.