af91c418_r_Broadband_Speed___The_Basics__an_affect_your_broadband_speed
[Cause] Bad weather
Heavy rain or thunderstorms can play havoc with broadband speeds. In fact, a severe storm could even damage your equipment permanently. We'd suggest unplugging your equipment from the phone line and power socket. You can plug them back in after the storm has passed.
Your Broadband Speed - The Basics
How this can affect your broadband speed