Newport County were knocked off the top of the Blue Square Bet Premier by Grimsby after losing to lowly Hyde at Rodney Parade.
Phil Jevons struck from the penalty spot after being fouled by Alan Julian to open the scoring.
Three close-range goals followed the 29th-minute opener.
Christian Jolley levelled for the hosts to give them hope but Luke Ashworth put his side back ahead and Scott Spencer settled the contest in the 90th minute.
VIEW FROM THE DRESSING ROOM
Newport County manager Justin Edinburgh told BBC Radio Wales:
"Obviously we're disappointed to lose the game. For long periods we dominated and we had a lot of chances but it wasn't to be and we got punished at the other end.
"The scoreline doesn't reflect the game but we've certainly dropped more points.
"The goals we conceded we'll be disappointed with. We'll assess them, get back to the training ground and continue to work hard and we'll turn this mini slump around."