Yes, you will probably need to do something about your RAM, but I would also consider adding cpus to my environment. In the system requirements it says QlikView requires multicore compatible processors, but my experience that you need at least 4 processors to ensure a good stable environment.
To summarise. Double the RAM double your processors. If that is not enough the add some more ram to your system.
A paralell activity is to identify the heavy ram consuming qv documents to see if you can optimizer it in some way. Tools like Governance dashboard and Document Analyser could be helpful to identifying apps and pinpointing document areas to improve.
Good luck
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