Concur: Bell peppers are the most difficult type to to grow. Cal Wonder is an older variety with little disease resistance. From your description I would suspect a root system problem. This could be due to soil conditions, too wet ( peppers can't stand wet feet) too few nutrients. too compacted etc. You may try digging it up and if the roots are in decent condition, replanting in loose friable well drained soil. Mosaic or Southern Blight are also possibilities, but there is no recovery from those. The only defense is disease resistent varieties, but even these are not foolproof.
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