I would uninstall the updater and the video drivers and start from scratch. OR, if this used to work then you could try a system restore. Also, when you get the low res I would look to see if there is any notification in the device manager. It could be that the GPU is malfunctioning and the driver is disabling as a result. I had a similar problem periodically with a desktop part where sometimes the resolution would be very low because Windows had disabled the driver due to a device malfunction.
Also, I'm moving your thread to the notebook area.
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