This is very unusual and rare issue. This may be any type of virus problem or windows software issue. So you need to scan your system through a good antivirus. If still the problem is not fixed then try to reinstall your operating system. Try to use the genuine version for better performance of your system. After this if you are facing this problem then you need to ask the Dell support center. Their experienced engineers and tech support team will definitely help you regarding your problems or they may also suggest you to take you system to the customer service center.
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