Sounds like classic low fluid. If you find it low and the color is good it will fix it for now but transmissions don't use fluid so there's a leak that needs to be found and fixed. If you don't find it low there could be some serious trans work/rebuild needed and hang on to your wallet!

T
Tom Greenleaf - MetroWest Boston - USA
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http://www.autoacsystems.com/tomgreenleaf/