It could be a connection problem but it is difficult to tell. If I were you, I'd take it to a local repair shop and have them take a look at it, an estimate for the repairs should be free. Good luck!
Check the refresh rate in Display Properties in the Control Panel it should be 60Hz; otherwise, it might be a physical connection issue; and you will have to have your laptop repaired.
Contact Lenovo's customer service and report the issue, they may be able to repair the problem
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