How to fix my Lenova IdeaPad S340?

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My Lenova laptop has recently started to develop issues, which coincidently started around the new windows update. The issues are:- asterisk key keeps typing by itself.- touch pad can be non- responsive at times - when shut down, if screen left open, percentage of battery left is shown and then begins to drop.- it loads quicker to the login details, then loading to the Home Screen takes longer than what it did before the update.Tried the following:- checked for sticky keys- tried removing windows update and reinstalling- tried Virus scans - tried reinstalling/updating keyboard drivers - tried

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