Why does Norton vpn on iPhone keep turning off?

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Issue abstract:

Detailed description: most every time I check my Norton vpn on my iPhone has been turned off. Why does this keep happening?

Product & version number: Norton vpn for iPhone

OS details:

What is the error message you are seeing? None

If you have any supporting screenshots, please add them:

What device and iOS version are you using?

Are you using the standalone Norton Secure VPN app or the VPN feature in 360?

What VPN settings have you set up in the app as far as auto connection for the VPN?