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Load balancer error 502

Hello,

Today morning approx. at 6 am UTC the Global External Application Load Balance started to give error response 502 each approx. 5 minutes. Other requests are successful. It had worked fine, we did not any change in the config.

What can be the reason?
There is a status detail: "config_not_found", in he request payload, section cache Decision 

I'll be glad for any help.

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