Wireless ping spikes

[giggity]

Hi, I have a DSL2750U router and TP-Link 300mbps PCI-E adapter.

Keep getting ping spikes when playing online games. When streaming, it's fine.

Reply from 10.0.0.2: bytes=32 time=570ms TTL=64
Reply from 10.0.0.2: bytes=32 time=2ms TTL=64

...

Reply from 10.0.0.2: bytes=32 time=1ms TTL=64
Reply from 10.0.0.2: bytes=32 time=8ms TTL=64
Reply from 10.0.0.2: bytes=32 time=2ms TTL=64
Reply from 10.0.0.2: bytes=32 time=2ms TTL=64

...

Reply from 10.0.0.2: bytes=32 time=2ms TTL=64
Reply from 10.0.0.2: bytes=32 time=44ms TTL=64
Reply from 10.0.0.2: bytes=32 time=136ms TTL=64
Reply from 10.0.0.2: bytes=32 time=1ms TTL=64
Reply from 10.0.0.2: bytes=32 time=1ms TTL=64

...

Ping statistics for 10.0.0.2:
    Packets: Sent = 1451, Received = 1451, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 0ms, Maximum = 1806ms, Average = 8ms

Anyone know some causes of this?
Thanks