It will. It is something else on your network that is using shared bandwidth.
Originally Posted by stardotstar
Femtocell - Wikipedia, the free encyclopedia
When using an ethernet or ADSL home backhaul connection, an Access Point Base Station must either share the backhaul bandwidth with other services, such as Internet browsing, gaming consoles, set-top boxes and triple-play equipment in general, or alternatively directly replace these functions within an integrated unit. In shared-bandwidth approaches, which are the majority of designs currently being developed, the effect on Quality of Service may be an issue.
Quality of service - Wikipedia, the free encyclopedia