I'm relatively new to Mulberry, though my collection is growing rapidly!
I'm not sure if they are prone to faults but I think of all the Mulberry customers, there is a small percentage here on TPF, and those here tend to be huge Mulberry fans with a collection, be it small or large. So, in terms of probability, you will hear of faults here.
What I have also heard is generally how responsive Mulberry customer services are when there are problems - ok, there may be the odd occasion when a Mulberry employee lets the side down, but generally the stories I've heard have been great.
Knowing this, I happily buy Mulberry knowing that if there are any problems, they will look after me
This may sound quite naive of me or looking at things with rose-tinted glasses but for me, it is that simple