Quindell PLC (LON:QPP) shares are down 11% in trading today after a Financial Times article raised doubt about an important joint venture with RAC called Connected Car Solutions which has apparently hit a snag as the two sides try to renegotiate the original deal that was announced earlier this year. RAC warrants for Quindell PLC (LON:QPP) stocks now seem overpriced Quindell PLC (LON:QPP), which bills itself as an IT firm but has been moving aggressively into legal services and processing insurance claims, announced in April that it would install 2 million black boxes at a pace of 50,000 per month in…