False positives are usually caused by the antivirus's heuristics system. Most good antivirus softwares like Kaspersky or NOD32 have really low false positive rates compared to others like AVG.
You may want to disable or lower the level heuristics, but this is not recommended, as infections may be out faster than the antivirus software updating their databases.
Getting a better antivirus would lower the rate false positives this from happening, but it can't totally stops this from happening.
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