Thornless blackberries not ripening

Google says this is due to mites or lack of water. I’m having this problem pretty consistently on my 4 bushes (Arapaho, I think). Covered with berries that look healthy but have stayed red and half-grown for a couple weeks now. Foliage on primo canes is starting to look dry and dead. If anything, I’d have thought these may be getting too much water. This is in the BR area. Anybody dealt with similar issue?