Spongy Brandywines

[Spartanburg123]

I have a Brandywine (Sudduth) with 23 tomatoes set and growing. The plant is 8 feet tall, and very robust. I noticed this evening that many of the tomatoes are now spongy, like they are shrinking inside. The skin is loose on a few of them. The rest of the plant looks fine. I water every morning, although it is blazing hot here in SC daily. Has anyone seen this? Thanks!!!