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masscan
TCP port scanner, spews SYN packets asynchronously, scanning entire Internet in under 5 minutes.
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It's likely they were also hitting NAT limits of their firewall, as evidenced by their other devices taking a performance hit. They'd likely see a lot of improvement if they directly connected to the internet, just like all those millions of compromised routers and firewall that make up so many botnets already do. Also, if you scan naïvely and willy-nilly then you are going to get blocklisted and throttled. This has been well established for years. Tools like massscan have flags to use exclude files to use to skip the known troublesome areas.