Cromer were knocked off the top of the Premier Division of the Norfolk Alliance on Saturday after enduring a nightmare afternoon at Old Buckenham.
Their excellent start to the season came to a grinding halt when they were dismissed for just 60 by the Bucks, who then went on to win by 10 wickets.
That opened the door for Downham Town and after a few scares they eventually took full advantage of their rivals' slip by making it four wins out of five and moving up to the summitt.
Town made 237-8 off their 50 overs and then edged home by three runs as opponents Garboldisham finished on 234-9.
Cromer dropped down to fourth as a result of their drubbing as South African seamer Nick Pentz weighed in with the impressive figures of 6-13.
After the early loss of Matthew Warnes for a duck, Frankie Sutton (16), Rob Purton (11) and Richard Charlwood (16) took the visitors beyond 50 for the loss of only two wickets, but once they went the tail collapsed like a pack of cards,
The Bucks wasted no time in wrapping up proceedings, getting home in the 14th over without loss.
They moved up to joint second as a result, alongside defending champions Brooke who saw off Horsford A by 61 runs at Manor Park to register a second win on the trot.
Cromer A had a much better afternoon, cruising to victory by nine wickets against Old Catton.
Tom Jackson returned the impressive figures of 4-37 as Cromer bowled out their visitors for 166 and it was then all pretty straighforward for the home batsmen, with an unbroken second wicket partnership between Nat Laws (69 not out) and Christopher Budd (71 not out) seeing them home.
Cromer have what looks like a decent chance to bounce straight back on Saturday when they play host to newly promoted Acle, who have lost their last three matches (1pm), while Cromer A visit Swardeston/CEMYS.
Sheringham, who had Saturday off, return to action in Division Four at Stow A.
In Division One of the Norfolk League Overstrand picked their first away win at Great Yarmouth as they shot the hosts out for 52 after making 147-6, with Neil Yarham taking 6-6.
Happisburgh lost by 32 runs to Saxlingham who made 184 and then bowled their opponents out for 152 (Wayne Catchpole 51).
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