every thing I have sold has been despatched within 2 working days of payment.
Your posting shows how ridiculously unfair the rating system is.
From the buyer's point of view, if a seller who posts within one day gets five stars it's perfectly fair to rate your two day service as four star. Or put it another way, what's the point in having a star system if sellers who post things the most quickly don't get the highest marks? Yet eBay treats a four star ratings as bad enough to suspend a seller!
The idiocy of it is that amateur, part time sellers having to fit eBay in between work and domestic responsibilities are expected to achieve the same ratings as full time professional sellers.
Don't imagine it's all an accident or stupidity. EBay has a longstanding ambition to become more like Amazon, a portal for large volume business sellers. Setting standards that small sellers find hard to meet is just part of the pressure to get rid of us!