Cannot connect to iTunes store

I keep getting a message that I "cannot connect to iTunes store" when trying to download. My Internet is working, I'm logged in to my iPod/ store account. I can view apps and do searches. When I click on the app and choose install, it shows all my apps (desktop?), says Waiting, and then tells me it cannot connect.

I've been able to download until now. Mu ios is up to date, i have plenty of room to download on. My date is correct, and I've tried logging out and back into my account and also turned the ipod off and on. Any advice would be appreciated.