Teddybear-UK

hi everyone, first time me having to post here. so the last 2 days or so, i keep getting booted for a too high average ping. now, i have BT infinity 2, d/l speed is 76mb, u/l is 20mb, ping is only 15. i haven't ever had this issue before and i'm not sure why i'm getting it now :/ any help would be appreciated. i can't use an ethernet cable as the hub is in the living room.