The u, j, m and 7 keys on the keyboard are not functioning properly on my macbook air. Please Help!

The u, j, m and 7 keys on the keyboard are not functioning properly on my macbook air. In its place are a random assortment of keys (Ex - u = "eqrw" or "IOUY"). This randomly happened when logging back in after sleep mode. No liquid damage at all. Please help!

OK, I fixed the problem by doing a SMC (System Management Controller) reset as follows:
1. Powered off my MacBook and removed everything connected except for the power chord.
2. When powered off, I held "Shift" + "ctrl" + "Option" + "Power button" for 5 seconds or so until the little light on the front started to blink rapidly.
3. Powered up my Mac, which took a little longer than usual to start and tested the "missing" keys which now works perfectly again.
Just added another couple of years usage with my aging mac :-)

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