leroy somer windlass

We have a 2000 Beneteau and it has the original windlass made by Leroy Somer. After taking the motor out of the casing, we have taken it to a shop to see if they can correct the problem of it working at times and not at others. We THINK it may be a loose wire because it works intermittently...

I have an Oceanis 36cc with a Leroy Somer windlass (no longer in production).The current chain size is 3/8 which I feel is to large since it jumps out of the gypsy when trying to raise the anchor. I have not been able find information regarding the correct size. I'm thinking about replacing it...