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In the end this issue was caused by my Virgin Media "SuperHub 3.0" router with it's dynamic wifi channel switching. I disabled it about 11 days ago and not a blip of an issue since. This also explains why it occurred more often when I was using my laptop upstairs in my house, something which I thought was just my imagination, but obviously an action that ...


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There is NO Raspbian Linux 4.19.81-v7+ You probably have Raspbian GNU/Linux 10 (buster) running kernel 4.19.81-v7+ You have probably broken your system by running rpi-update "In normal circumstances there is NEVER a need to run rpi-update as it always gets you to the leading edge firmware and kernel and because that may be a testing version it could ...


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Here's the relevant part of the official docs. Min and max: GPU memory in megabytes, sets the memory split between the CPU and GPU; the CPU gets the remaining memory. The minimum value is 16; the technical maximum value 944 [for the RPi 4]. The default value is 64, values above 512 will not provide increased performance and should not be used. ...


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You shouldn't need to set it beyond the default value in the plain Raspbian /boot/config.txt. Max value is 128M. Setting it beyond 128M can leave your Raspberry Pi 4B unbootable. GPU memory on a RPi4B isn't used in the same way as on earlier Raspberries.


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