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Unfortunately, it sounds like your raspberry plants are suffering from Verticillium wilt fungus, which also commonly affect blackberries, tomatoes, and potatoes. There is little you can do now other than pull the plants and fumigate or sterilize the soil before replanting again.

It may be orange rust, which is dangerous for black raspberries. Typically, this disease appears on the leaves, but it can occasionally show in the fruit. Here is more information on that:
https://extension.psu.edu/plants/gardening/fphg/brambles/diseases/rust

It could be another form of fungus as well. You can treat the plant with fungicide, which will kill most fungus, but will not kill the range rust mentioned above.

The following articles should be of some help to you: https://www.gardeningknowhow.com/edible/fruits/raspberry/care-of-raspberry-plants.htm
https://www.gardeningknowhow.com/edible/fruits/raspberry/pruning-raspberry-bushes.htm

You could try pruning and perhaps amending the soil around the bushes with compost or organic matter.

It is true that you should not plant raspberries within 300 feet of any wild blackberry bushes. You should also stay away from tomatoes or potatoes. Wild blackberries can carry fungus and viruses that can make your raspberries sterile and this precaution prevents your raspberries from catching the fungus. This problem does not affect blueberries.

Spring or early fall is the best time to plant these berries. Do not however, plant them near wild berry plants. As the wild types harbor a host of fungal and viral disease than can spread.

These articles will help: https://www.gardeningknowhow.com/edible/fruits/raspberry/care-of-raspberry-plants.htm
https://www.gardeningknowhow.com/edible/fruits/raspberry/pruning-raspberry-bushes.htm