I see @danj and I have already answer several questions on this machine. First thing I would do is run a good “Paid For” anti-virus like Symantec Endpoint protection. While Apple products have the reputation of not having viruses, that was during Steve Jobs time. Apple has become a much greater target in the Tim Cook era. About 70% of the machines I get in now are infected.
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Please confirm that your are just running Sierra and not High Sierra.
I see @danj and I have already answer several questions on this machine. First thing I would do is run a good “Paid For” anti-virus like Symantec Endpoint protection. While Apple products have the reputation of not having viruses, that was during Steve Jobs time. Apple has become a much greater target in the Tim Cook era. About 70% of the machines I get in now are infected.