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Jackfruits and many other artocapus species have high turnover rate. The ground under my trees is absolutely littered with fallen leaves that start to yellow first. This is normal, nothing to worry about.The tree is very hardy, once a week watering maybe too much, especially since cool weather in FL. In India they grow wild in some places with 8 months long dry season.
I live in rockledge just on the other side of the river from you and boast a golden nugget jackfruit about 4 moths ago from that nursery by the airport. I repotted it immediately from a 3gallon pot since it was about 4foot tall. I forgot to water it for about 10days a couple months ago when it was hot. Same thing happened to me. It it was under watering not over, all leave dropped and were yellow. It came back strong. I did plant it in a pot so I could bring it inside until our winter is over because you never know when we might get some weird 30F night out of the blue. I’ll plant it once spring hits so it has a better chance to mature more for next winter.