4 previous and the current one !!! that could be 5 quite a few in 5 years, out of 5 owners none of them have liked it / enjoyed ownership enough to keep it for a while!!!
1st owner could have kept it 3 years from new and that means the other 3 / 4 have moved it on mighty quick.
It could have been pre reg'd so if it was 4 recorded owners this means in reality only 3 human beings plus a garage for sales figure reasons - or test drive car
It does seem a lot of owners though....
You need to be digging for clues - repossession ! cash owed outstanding, insurance repaired /fell out of love etc etc
If price is right and you are satisfied that everything is good then don't let it be too much of an off putter - cause if you own it for the next 10 years then it will only have had 5 owners in 15 years
Good luck with whatever your decision is
and enjoy.....