Which hub do you have? Is it a Tivo & not a V6? Is it just wifi thats gone or do ethernet cable connected devices drop out too ?
If you havent already done this... Pull the plug on all boxes and wait 5'. Swich the Hub back on and let it go through start up. Then plug Tivo back in and let it start up. See if that helps. If not try a pinhole reset of the Hub.
-------------------- Services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired 2 WiFi,) SH2 in modem mode with Airport Extreme Router. On VIVID200, Talk Anytime Phone, x2 Mobile SIM only iPhones.