Dropping packets when your CPU can't keep up is expected. It's the direct effect of that.
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The problem is most likely to be not within your VM, but with the virtualizer.
Virtualization adds some overhead, and whilst modern virtualizers have gotten pretty good at it, you're requesting that
This might take away CPU cycles on your host side that your VM doesn't even know of &#; your 100% is less than it looks!
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So, first of all, make sure your virtualizer does as little things with the network traffic as possible. Especially, no NAT, but best-case hardware bridging.
Then, the freq-xlating FIR definitely isn't the highest-performing block. Try using a rotator instead, followed by an FFT FIR. In your case, let that FIR decimate by a factor of 2 &#; you've done enough low-pass filtering to reduce the sampling rate without getting aliases.
Lastly, might be a good idea to use a newer version of GNU Radio. In Debian testing, apt will get you a 3.8 release series GNU Radio.
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