af91c418_r_Broadband_Speed___The_Basics__an_affect_your_broadband_speed
[Cause] Electrical interference
Household equipment (either yours or your neighbour's) can cause interference which often affects broadband speed. Things like TVs, alarms, fairy lights and set-top boxes are known to cause problems.
Your Broadband Speed - The Basics
How this can affect your broadband speed