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Re:Raspberry Pi 4 WiFi stops working at 2560 x 1440 screen r... by exikyut on Thursday November 28, 2019 @03:11AM (#21655491)
Or something like https://mjg59.dreamwidth.org/11235.html is happening.
Re:Raspberry Pi 4 WiFi stops working at 2560 x 1440 screen r... by mjg59 on Thursday November 28, 2019 @03:17AM (#21655518)
That resulted in a wide variety of different failures, from the kernel oopsing to various userspace components crashing. It would be very unusual to have unexpected DMA trigger such a specific failure.

(for avoidance of doubt, I wrote that blog post)