These are the best cables I've ever used and they have a lifetime warranty- https://www.amazon.com/Anker-PowerLine-Lightning-Certified-Compatibility/dp/B071JQSQLN/

All of their PowerLine cables are great, but these are the best. It may not be worth your time to contact support to get replacements though.

I've also heard good things about Monoprice's MFi certified cables- https://www.monoprice.com/product?c_id=112&cp_id=11213&cs_id=1083101&p_id=27402