The answer to 'flickering surge protector' is that a flickering or blinking surge protector is typically a sign that it needs to be replaced. This indicates the surge protector has reached the end of its useful life and can no longer properly protect your electronic devices from power surges and spikes.
Surge protectors have a limited lifespan and will eventually wear out over time, even if they haven't experienced a major surge event. The flickering or blinking lights are a warning that the surge protection components inside the unit are starting to degrade and fail. At this point, the surge protector is no longer providing reliable protection and should be replaced to avoid potential damage to your connected devices.