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I've seen the same kind of behaviour before.
In some cases the following has helped:
Setup a separate router that acts as AP.
Make it a 5 GHz only network, hidden SSID, WPA2 Personal encryption with both TKIP/AES, 802.11n only. If this router has multiple external antennae, even better. Don't skimp out on this router, and make sure it supports 5GHz, because many don't.
Most importantly, patch the driver station into this separate router with a wired connection, and disable the wireless on the driver station computer.
Make sure the radio on the robot is switched over to bridge mode, and that you are getting good and consistent Ping times.
When we do important demos, the separate AP is the setup we like to use. When possible, we avoid switching the robot radio over to AP.
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