Why are my veggies dying?

[GFTL]

I have various vegetable plants that are dying for no good reason. Pepper plants that are producing and I've even harvested some. Tomatoes doing the same. Zuchinni doing great. Then for no reason some, not all of the plants look like they're undewatered and just die. They are in all kinds of beds: raised, back to eden (woodchips) wicking, even 2 separate compost bins. 4 zuchinni in 2 compost bins and one dies.10 pepper plants in wicking beds and 4 die. I'm talking full grown plants. Any suggestions?

 

[Ladystoic]

Can you attach pictures? It's difficult to know without seeing what the plants look like!

 

[GFTL]

Too late I already pulled them. They looked like they just weren't getting water. Some of them were replacement plants. I always start to many seeds so I have plenty of backups. Have used them all this season.