It does sound like something is wrong in the roots. It may be a root rot fungus or the result of soggy wet soil conditions which often lead to fungal problem in the roots. I suggest you dig down a few inches and feel the soil to see if it is just moist or soggy wet. Try to water just enough to keep it moist. There are fungicides for drenching the soil to fight root rots but fixing the moisture problem is the simplest, least expensive way.
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