UKIP's economics spokesman Patrick O'Flynn blew open simmering tensions within the party in an interview with The Times, saying Mr Farage was no longer the "cheerful, ebullient, cheeky, daring" politician of recent times.
Mr O'Flynn said the UKIP leader's behaviour risked the party being seen as an "absolute monarchy" and blamed Mr Farage's "aggressive" and "inexperienced" advisers.
He called for Mr Farage, who lives in Kent, to adopt a "much more consultative and consensual leadership style".
Mr O'Flynn's comments come after Mr Farage was widely mocked for resigning as leader after failing to win the South Thanet seat he stood for in the General Election, only to be reinstated three days later after the party's National Executive Committee rejected his resignation.
Kent Police have confirmed that they are investigating allegations that ballot boxes may have been tampered with, in what was one of the highest profile election battles in the country last week.
Last Friday morning, Nigel Farage was defeated in his attempt to become an MP in South Thanet for UKIP. He lost to the Conservative candidate by more than 2,800 votes.
But after claims that ballot boxes were interfered with, Kent Police say they are now conducting enquiries into electoral fraud in the constituency. Here's our Political Correspondent, Phil Hornby.
On Monday 11 May, Kent Police was contacted by a member of the public from outside the county with a concern around election fraud due to speculation on social media in South Thanet. Initial enquiries by officers have been carried out and so far no evidence of electoral fraud has been found.
A single complaint has been lodged with Kent Police by a member of the public, from outside of the county, with concerns around the Thanet Parliamentary election - following speculation on social media. Kent Police has an obligation to follow up this complaint. Thanet District Council is not under investigation for election fraud. The council’s Returning Officer is satisfied that the correct processes were followed and a member of the Electoral Commission was present at the election in Thanet.
In response to the speculation on social media: Thanet’s parliamentary boundary is larger than the district boundary – extending into the Canterbury and Dover area so comparing the parliamentary and district election results is misleading. There were no lost or stolen ballot papers.
Kent Police have confirmed that they are looking into an allegation of electoral fraud in the Thanet South constituency seat.
The leader of UKIP Nigel Farage temporarily resigned as party head over the weekend after he failed to win the seat. Instead, Craig Mackinlay, a Conservative became the Thanet South MP after last Thursday's General Election. He won 18,838 votes compared to Mr Farage's 16,026.
UKIP took control of Thanet District Council in following the local elections counton Saturday.
"Kent Police has received a report of electoral fraud. Inquiries are ongoing."
Kent Police are looking into an allegation of electoral fraud in Thanet South, the seat which Ukip leader Nigel Farage failed to win at the general election.
Nigel Farage's offer of resignation was rejected by UKIP members because of the success of his election campaign, according to a statement by the Chairman of UKIP has revealed.
As promised Nigel Farage tendered his official resignation as leader of UKIP to the NEC. This offer was unanimously rejected by the NEC members who produced overwhelmingly evidence that the UKIP membership did not want Nigel to go
The NEC also concluded that UKIP's general election campaign had been a great success. We have fought a positive campaign with a very good manifesto and despite relentless, negative attacks and an astonishing last minute swing to the Conservatives over fear of the SNP, that in these circumstances, 4 million votes was an extraordinary achievement. On that basis Mr Farage withdrew his resignation and will remain leader of UKIP. In addition the NEC recognised that the referendum campaign has already begun this week and we need our best team to fight that campaign led by Nigel. He has therefore been persuaded by the NEC to withdraw his resignation and remains leader of UKIP.
He may have lost his bid to become an MP, and even resigned as UKIP leader yesterday because of it - but Nigel Farage had time today to hail more successful UKIP colleagues. More than thirty of them have been elected as councillors for Thanet District Council in Kent.
Nigel Farage has officially stood down as the leader of the UKIP party.
During his speech at the Botany Bay Hotel in Broadstairs he criticised the first past the post voting system saying it was unfair for smaller parties.
Mr Farage said although today is tinged with sadness he feels happier than he has for years.
Suzanne Evans will be the new leader.
Nigel Farage is likely to step down as leader of Ukip if he loses his seat in South Thanet, creating a "real blow for the party", political journalist Isabel Hardman has told ITV News.
The assistant editor of The Spectator has heard from "a very good source" that the party have not won the constituency in Kent.
Hardman said: "If he doesn't win that seat then he will have to step down as Ukip leader because he said he would. In that case Ukip would be pitched into a leadership battle which would be very difficult for the party because Farage is a magnetic figure who has held the party together.
"Even though he has some very impressive people behind him, they're not quite the same as Nigel Farage - so it would be a real blow for the party."
Earlier, Mr Farage gave aninterview to ITV News in which he attacked the press before walking off.