If your FireStick keeps flickering, there are several effective methods to resolve the issue. First, ensure that all cables are securely connected, and try using a different HDMI port on your TV. Updating the FireStick firmware and apps is crucial, as outdated software can cause display issues. Adjusting the display settings on both the FireStick and TV, such as resolution and refresh rate, may also alleviate flickering problems. Additionally, checking for interference from other electronic devices and keeping the FireStick adequately ventilated can prevent overheating. If these steps don't work, a factory reset or contacting Amazon customer support for further assistance might be necessary to ensure a seamless streaming experience.