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Glitchy screens can be caused by a display driver degrading, by poor contact of the wires with the components or by overheating. Check to be sure you have the latest driver installed. If so, try reinstalling that driver. Then check for things that could be allowing your unit to overheat.
Cool air enters the underneath side of your Chromebook and the heated air exits the sides and the top. By lying your unit on a soft carpet or bed, air that needs to circulate through the unit cannot get past the soft material blockage, resulting in overheating. When any chips or components begin to overheat, the Chromebook automatically shuts itself down to prevent damage from occurring.
Another thing to keep in mind is that with air circulating through the chassis constantly, dust bunnies tend to fill up the space inside your laptop and this further blocks air circulation which can also cause shutdowns for overheating. The cover should be removed periodically and the insides blown out with compressed air. It should be noted that for each critical degree rise in processor temperature you get a corresponding slowing in the speed of transactions.
Regular laptops have settings where you can set the battery to place your unit on standby or sleep when the battery charge dips below whatever number you set it at. If Chromebooks have a Control Panel go there, select battery and then make the settings a little more reasonable. If the setting is currently to shutdown your laptop at 60% charge, change the setting to go to sleep rather than shutdown and not to do so until the battery charge drops below 10%. That’s more workable.
Overheating is a common cause of unexpected shutdowns. Many with small laptops use their machines on the floor, sometimes of soft carpet or on their bed, another soft surface. Problem with that is this: major airflow is required to be circulated through the inside of your Chromebook, especially to circulate around the CPU and GPU to remove excess heat and blow it out of the inside of the case.
Random shutdowns can also be due to overheating.
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