Some keys won't work properly on MacBook Air

I've had the MAB for about 3-4months now and i never had this problem. All of a sudden, possibly after updating MAC OS, the keys such as 'r' and '4' and 'v' will not work properly. It is not like they are not working at all, they just show weird keys.
Eg. when i press 'r' 2-3 times, 'IOU' or 'awerq' would show up most of the times. same for v and 4.
anyone had this problem? I tried playing around with the language settings, resetting my keyboard shortcuts, but no luck.
do i have to format my MAB?
Thanks!

anyone???? could it be a hardware problem???

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Hi Asadkhan92,
Welcome to Lenovo Community!
As per the query we understood that you are facing an issue with the keyboard in your Lenovo G570 laptop.
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Click here to open a link where you can select the country and get the exact contact support number. I’m sure they will be a great help.
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Some keys are not working

I have HP pavilion notebook PC with product number F6C53PA#ACJ serial number [Personal Information Removed] BIOS F.34-10/31/2013 keyboard revision 29.34.
Some keys in my keyboard are not working properly. I couldn't type < and > in microsoft office, on the websites etc.

Hi there
Welcome to the HP Support Forums! It is a great place to find the help you need, both from other users, HP experts and other support personnel. I understand that some keys are not working on your keyboard. I am happy to help with this. Are those keys working consistently in some applications? For now I would suggest you look at it as a cleaning issue. Perhaps some dust or debris is affecting the key presses.
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