Unusual Crash Related To Vsserv.exe

I'm getting an BSOD under unusual circumstances that may be pointing to a glitch in Bitdefender. Dunno if you'll be able to replicate this or not, but I'll explain things the best I can and upload a minidump.

I'm running Calibre 2.4.0 x64 on Windows 10 x64

When I engage the bulk Download Metadata function (CTRL-D after selecting several books), the program automatically downloads book info. After a while the whole system crashes. So I decided to look at the minidump.

It comes up with this message.

Loading User Symbols

*******************************************************************************

* *

* Bugcheck Analysis *

* *

*******************************************************************************

Use !analyze -v to get detailed debugging information.

BugCheck 3B, {c0000005, fffff8009924df13, ffffd00022524fb0, 0}

*** WARNING: Unable to verify timestamp for bdfwfpf.sys

*** ERROR: Module load completed but symbols could not be loaded for bdfwfpf.sys

Probably caused by : NETIO.SYS ( NETIO!StreamProcessCallout+793 )

So I click on !analyze and it points me to this:

CPU_COUNT: 4

CPU_MHZ: c79

CPU_VENDOR: GenuineIntel

CPU_FAMILY: 6

CPU_MODEL: 3c

CPU_STEPPING: 3

CUSTOMER_CRASH_COUNT: 1

DEFAULT_BUCKET_ID: WIN8_DRIVER_FAULT

BUGCHECK_STR: 0x3B

PROCESS_NAME: vsserv.exe

CURRENT_IRQL: 0

ANALYSIS_VERSION: 10.0.10240.9 amd64fre

LAST_CONTROL_TRANSFER: from fffff8009924b555 to fffff8009924df13

VSSERV.exe is related to BitDefender, so that's why I come here- the crash hasn't come up at any other time; only after the recent update to windows 10 (KB2267602) has it occurred. The BSOD only happens why I run the automated metadata download for over 50 books- it doesn't seem to occur at any other time, or when manually downloading metadata. Also, the Debug minidump doesn't say anything about Calibre, so I don't get it.

I've included the most recent minidump- hope it's helpful in some form.

https://www.dropbox.com/s/kwceerlzrzpzvdn/N...rchive.zip?dl=0