Is there something that could cause multiple miscarriages after already having one child?

Many causes possible. Many possible causes of miscarriage exist. You have more chance of another success than multiple miscarriages with no child. With 2 or more miscarriages we look for low egg supply, uterine problems like polyps or fibroids, abnormal antibodies, blood clotting disorders, hormonal problems. Genetic tests if needed. See a reproductive endocrinology/ infertility (rei) specialist for tests & treatment.
DNA fragmentation. Have your husband checked for dna fragmentation index as men with high levels of dfi in their sperm may be at risk for miscarriages.