Without seeing them I would guess it is fusarium wilt. It doesn't have to show just on one side when it starts. It can start with just slight wilting followed by yellowing and dying of leaves and a branch or two but if it is not severe then sometimes the plants can linger for a long time with reduced production. The only true way to deal with it is to use resistant varieties or graft non resistant varieties onto a root stock that is resistant. I gardened with it for decades until it got so bad that I had to start grafting in order to have the varieties that I liked survive long enough to be productive.
Bill
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