Thought this was fake, but its true!
https://www.justice.gov/opa/pr/justi...otnet-infected
Regardless, it's always a good idea to reboot your router once in a while. Your router can run low on resources like its on-board memmory, so rebooting it can give you a nice speed boost.
A few other tips: Update its firmware, make sure you're using the best security it has, use a nice long password, and turn off its SSID.