[shakna]

There's several small scale WiFi chips that share clock source with USB - it would be unsurprising to find that the WiFi and video interface are sharing the same clock, so drawing too much from either could directly effect the other.

These kinds of problems are common in embedded computers, like the Pi. Just as common as software.

[londons_explore]

Clocks will all be buffered due to physical distance between the GPU and WiFi IP core on the SoC so it's unlikely to be a clock loading issue.

[shakna]

Buffering isn't really the problem I was talking about, it was more the shielding of the clock.