If can you download network monitoring software such as Wireshark. This should allow you to track all network activity and source any odd behaviour.
If you've got wi-fi going it could be someone freeloading off it.
You really need to be able to get onto the router etc to see whats going on, latency won't really pick much up.
@Rieley started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
If can you download network monitoring software such as Wireshark. This should allow you to track all network activity and source any odd behaviour.
If you've got wi-fi going it could be someone freeloading off it.
You really need to be able to get onto the router etc to see whats going on, latency won't really pick much up.