Parallels 10 wipes browser cache on guest OS

I'm using OSX10.10 and windows 10 DP as a guest os. I run some webs that cache a good deal of data (around 1.2 gigs).
I noticed recently that if the VM or said app is idle for a while, browser cache where the data is stored (IE in this case) is wiped and I have to redownload it again.

Is this a feature to save space? If yes, how can I turn it off? If not, what might be the issue?
 
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