Most likely it’s too late.
But, moving forward, seriously!
On all of my expensive electronics I have the highest quality surg protector that includes a connection for cable, in addition it comes with insurance on the equipment that it is connected to. My background is energy management engineering. Many of the power companies also have insurance available for you.
Poor power quality occurs more often than anyone not in the industry realizes. At various times of the year, the power companies actually send an international surg to clear the power lines.