This problem has probably actually been happening for some time, but I've only really noticed it having started to play a lot of League of Legends recently. 95% of the time I have 50-60ms and no problems, but as soon as there is any use of the internet on any other device my ping will spike to 200-300. Simply opening 2 browser pages on a laptop downstairs can get me 1000ms and "attempting to reconnect" warnings. Should this really be happening? I can download at my max speed on my pc and only see around 100ms difference in ping.

System Up Time:
86:42:16

Port Status TxPkts RxPkts Collisions Tx B/s Rx B/s Up Time
WAN PPPoA 7621779 9162921 0 2287 4228 86:40:34
LAN 9165914 7805756 0 4705 3016 86:42:16
WLAN 302462 81105 0 437 34 86:40:26
ADSL Link Downstream Upstream
Connection Speed 15163 kbps 982 kbps
Line Attenuation 34.5db 19.4db
Noise Margin 6.5db 8.5db