Crash on exit (PyQt, Qt, abnormal termination, quit, segfault, SIGSEGV)

On 4.0.9 (but this was also present in previous versions) if you normally close Electrum (both stand alone and installed version) on this OS you will get an abnormal crash.

OS: Windows 7 Ultimate 32 bit
(updates to date)
It's quite easy to reproduce, just normally start electrum , leave it on for few minutes and then normally try to close it from the close button. It will immediately pop-up this (in 8/10 cases):

Here is the full dump:

roblem Event Name:	BEX
  Application Name:	electrum-4.0.9.exe
  Application Version:	0.0.0.0
  Application Timestamp:	00000000
  Fault Module Name:	StackHash_0a9e
  Fault Module Version:	0.0.0.0
  Fault Module Timestamp:	00000000
  Exception Offset:	1e175f42
  Exception Code:	c0000005
  Exception Data:	00000008
  OS Version:	6.1.7601.2.1.0.256.1
  Locale ID:	1033
  Additional Information 1:	0a9e
  Additional Information 2:	0a9e372d3b4ad19135b953a78882e789
  Additional Information 3:	0a9e
  Additional Information 4:	0a9e372d3b4ad19135b953a78882e789

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No source file, test, or entry point is named. Reproduce the exit crash on Windows 7 32-bit using the standalone and installed Electrum builds, then trace the shutdown path using the supplied crash dump. Done means normal close completes without an abnormal termination or SIGSEGV.