vauxhall combo

[chalky16]

Hi. Vauxhall Combo 1.3 cdti van 2009, recently had trouble with fuel filter warning light, flashes on then off immediately with a dip in power, but then its restricted to 3000 RPM. Changed the fuel filter and all was fine, done 850 miles and the same thing has happened again. Van has done 107k. Any clues please ???

Thanks