we have a 2002 passage 456 with the original horizon 1500 horizontal windless, we have 5/16 high test chain, it's worked flawlessly for 10 years we have owned the boat til just recently, the issue is on retrival when it comes under load the chain will suddenly lose its grip and 2-4 links go forward then catch again and this keeps up making retrival of the anchor a noisy and difficult process. Nothing has changed as far a alignment or equipment like anchor swivel etc in the last 3 years. I watched closely as the slipping was happening and I could not see any play in the shaft it was turning all the time and the slippage was the chain jumping . I assumed the gypsy was worn so I purchased a new on and installed it today, no change in the issue. I have noticed the chain seems twisted and it seems to spiral out to the water , can a twisted chain do this, if so how to I go about removing the twist? We're in the Caribbean now and not close to a marina at this time. Any help is appreciated. I did examine the swivel on the mantus anchor off ours and it was frozen, I fixed that perhaps that was what had put the twist in the chain.