[7.0.141 beta] SSMS 2012 is restarting

[7.0.141 beta] SSMS 2012 is restarting

Not always but sometimes when I start SSMS after connecting to SQL Server I get the message that SSMS is restarting.
Only in Event viewer I see this error

Nume aplicatie cu defecte: Ssms.exe, versiune: 2011.110.5058.0, marcaj temporal: 0x537406e3
Nume modul cu defecte: SqlAssistPrefs.dll_unloaded, versiune: 0.0.0.0, marcaj temporal: 0x53bd3d33
Cod exceptie: 0xc0000005
Deplasare defect: 0x12829e8a
ID proces defect: 0x1d88
Oră de început aplicatie cu defecte: 0x01cf9f4b2c66051d
Cale aplicatie cu defecte: C:\Program Files (x86)\Microsoft SQL Server\110\Tools\Binn\ManagementStudio\Ssms.exe
Cale modul cu defecte: SqlAssistPrefs.dll
ID raport: 4fed456f-1615-11e4-95d6-005056c00008

Detail

Ssms.exe
2011.110.5058.0
537406e3
SqlAssistPrefs.dll_unloaded
0.0.0.0
53bd3d33
c0000005
12829e8a
1d88
01cf9f4b2c66051d
C:\Program Files (x86)\Microsoft SQL Server\110\Tools\Binn\ManagementStudio\Ssms.exe
SqlAssistPrefs.dll
4fed456f-1615-11e4-95d6-005056c00008
Sorry it's not in english.
I've tried to find something in SA log but in %APPDATA% folder I don't have any SA log file.

Thank you very much. SSMS crashing randomly on closing or opening is a known issue. Unfortunately ware unable to reproduce it reliably and still looking for the root cause. If you figure out how to reproduce it reliably, please let us know. If it will help us to fix the issue before the launch of version 7.

Sometimes on my Win7 X64 when I close SSMS it seems to stay active as a process in background.
If I start then SSMS I get that error.
Maybe it happens also in other situations.
I will further investigate