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Actually, stopping widget won't help neither. Traffic is still leaking. trying to suppress background traffic from Android system settings..
Service d'assistance aux clients par UserEcho
Service d'assistance aux clients par UserEcho
Disabling background transfer stops the leakage, but app is not functioning when screen is locked(( so this is not a workaround for me.
By the way, TuneIn behaves in the same odd manner. However some less-known radio tuners dont.