* Dollar/yen briefly jumps more than 1 pct
* Market wary of intervention with yen near record high
* Fall in U.S. yields pressures dollar ahead of FOMC
TOKYO, Nov 1 (Reuters) - The dollar jumped against the yen on Monday in a market wary of Japanese intervention but quickly gave up its gains as traders cited talk that there might have been a miss-hit or technical glitch rather than intervention.
The dollar rose more than 1 percent to as high as 81.60 yen after hitting a fresh 15-year low of 80.21 yen in early Monday trade. But the currency pared much of the gains to trade around 80.60 yen, up 0.3 percent on the day.
A Japanese Ministry of Finance official declined to comment on the sudden move in dollar/yen.
"Everybody was nervous. There's been lots of conflicting information," said a trader at a European bank.
Traders said the market was becoming cautious about intervention as the dollar/yen came within a whisker of its post-war record low of 79.75 yen.
Traders said there was also talk in the market of a miss-hit or technical problem as the dollar jumped to 80.70 yen from 80.40 yen around 0000 GMT, which initially led traders to believe that Japanese authorities had intervened.
"I think there was (dollar) buying by people who thought there was intervention," said a trader for a major Japanese bank.
But he said: "Judging from the price action (after that), the market probably doesn't think right now that there had been any intervention."
Japanese authorities intervened to sell yen for the first time since 2004 on Sept. 15, intervening repeatedly through the Asian, European and U.S. trading day to drive the dollar up from a 15-year low.
But most traders think Tokyo has refrained from intervention since then even as Japanese policymakers continue to warn of "decisive actions" on currencies if needed.
The euro was little changed at $1.3953.
The dollar is broadly under pressure after U.S. Treasury yields dropped on Friday, with the two-year yielding falling near a record low ahead of the U.S. Federal Reserve's policy meeting this week. (Reporting by Hideyuki Sano, Charlotte Cooper and Masayuki Kitano; Editing by Chris Gallagher)