Talk about acid reflux.

The bitter feud between Papa John’s and its exiled founder keeps coming back — only this time the company is causing the heartburn.

The pizza chain accused founder John Schnatter of trying to undermine CEO Steve Ritchie and disobeying the board — including his fateful decision to complain about the NFL kneeling controversy on a conference call late last year.

“Schnatter has demonstrated a continued pattern of ignoring decisions of the board, both in his role as CEO and as non-executive chairman,” a special committee of Papa John’s board said in a statement late Wednesday.

The timing coincided with an exclusive story in The Post on Wednesday that drew from a 61-page letter, written by Schnatter, lamenting what he called a “frat boy” culture a Papa John’s.

As one of its many counterclaims, the committee reported that Schattner — “in direct defiance of [board] instructions” — used a Nov. 1 earnings call to blame soft company sales on the NFL’s kneeling controversy.

The committee also revealed that when market research called for a new Papa John’s spokesperson, Schnatter independently commissioned TV commercials that continued to star himself.

After handing his CEO title to hand-picked successor Steve Ritchie on Jan. 1, Schnatter continued to give “management directions without informing the CEO or the board,” according to the board’s letter.

In addition, the board repeated its denial of a claim by Schnatter — made earlier this week in a letter to franchisees — that it had agreed with him that Ritchie “needed to go” earlier this summer. It also denied that it had invited Schnatter to become executive chairman of the company.

Schnatter was ousted as the pizza chain’s chairman in July after being accused of using the N-word on a conference call. Since then, it alleges, “Schnatter is promoting his self-interest at the expense of all others in an attempt to regain control.”

Papa John’s founder disagreed with the committee and, through a spokesman, accused it of trying “to hide the true facts.”

Those allegedly include Schnatter’s preparation of a report calling for Ritchie’s replacement “long before this latest controversy about Schnatter surfaced,” the spokesman said.

He also relayed Schnatter’s fear that continued leadership by the likes of director Mark Shapiro — the board’s corporate-governance head — will do to shareholders “what happened to Six Flags’ shareholders while Shapiro was CEO.”

Six Flags filed for bankruptcy under Shapiro in June 2009, who left the company within days of its winning reorganization approval in May 2010.