It is likely that they are starting to suffer from a root infection. Watering more would only further the problem. Make sure that the soil has time to dry out a little between waterings when possible. I recommend adding, both, dolomitic lime and wettable sulfur. The wettable sulfur will kill off most infections while the dolomitic lime will recondition the soil to a proper pH.
Answered on March 17, 2019
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