Infected? Your card reader cannot be infected.
But if it's working like that, it's not the batteries.
If you have to press the button it is very likely that it's not the button itself but the pressure on the card reader that helps.
Open the reader, clean the contacts (gently!) - make sure they are not bet or twisted - if they appear to not stick out enough you can try to bend them a bit (again, very gently!)
You should examine the edges of your gold card, too - if they appear to be somehow damaged or worn off you can fix them with a bit of scotch tape.
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