Question:

What should I do if my A70 or A80 device constantly connects and disconnects from USB?

Answer:

 If your A70 or A80 device is showing the USB connect/disconnect notification repeatedly, it might be due to water damage, corrosion, rust, or dust in the interface (IF) connector. For SM-A705 and A805 series models, this issue requires servicing. Note that obvious liquid damage or corrosion on the USB port won't be covered under warranty.

Terms:

A70 or A80: Samsung Galaxy A70 or A80 smartphone

USB connect/disconnect notification: Alert displayed when the device connects or disconnects from a USB cable

Display: Screen that shows information and alerts

Water damage: Damage caused by exposure to liquids

Corrosion: Rusting or eating away of metal due to chemical reactions with the environment

Rust: Red-brown flaky substance formed by the oxidation of iron

Dust: Tiny particles in the air that can settle on surfaces

Interface (IF) connector: Part on the device responsible for connecting to a USB cable