Did you get a warning light ?
Presumably the engine management system detected a fault and put it into limp mode to prevent potential damage. Fault not re-detected after restart so normality returns.
I'd carry on for a few days and see if it does it again. If so then take it to dealer for a fuller report. Then discuss with techs what any fault code might mean and go on from there.
My 12yo HDi Xantia occasionally 'gags' under acceleration and puts it's EM fault light on but does not invoke limp mode. HAving had the fault codes read - some valve on the turbo is sluggish to either open or close - I decided to live with it.
If it was a newer car or in more demanding role than station hack and back up for family Berlingo I might have had it seen to.
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