Was it an off day or an indication of a general slide in services? If the latter, maybe it's time to move on. I'm never convinced that a word goes down that well with some girls and in fact is likely to be the line in the sand with some. However, Much depends on your existing relationship with girls. As the old management adage goes, if I don't know there's a problem, I can't do anything about it. If she's the type of girl you can really speak to, have a word and if you are both happy to continue, give it another go and see how things pan out