During move large files (700mb+) to external drive formated NTFS via USB 3.0 I've noticed strange things about explorer.exe (I am using Windows 7 up to date)

• Sometimes after move file the explorer get stuck (ie. it can happen after few files during move of several large files) - moving window freeze and I am unable to kill explorer (via taskmgr, or cmdline TASKKILL). In command line I've got something like this (taskmgr shows that explorer.exe is still running - I've got the same PID every time I try to kill it and no diagnostic message):

C:\Windows\system32>TASKKILL /F /IM explorer.exe

SUKCES: proces "explorer.exe" o identyfikatorze PID 6296 zostal zakonczony.

C:\Windows\system32>TASKKILL /F /IM explorer.exe

SUKCES: proces "explorer.exe" o identyfikatorze PID 6296 zostal zakonczony.

• If I try to run another explorer.exe process at this point, I got desktop icon and start bar back but I cannot open any explorer window

• After few minutes explorer.exe finally dies and I am able to rerun it without rebooting

• File that I moved have two copies - one local and one on the external drive (the original file wasn't delete after move); Both copies seems to contain the same data (same length and CRC info)

• If this happen during move of multiply files, only some files are moved and one of them have two copies (both locally and on the external drive)

What can I do to fix those explorer hangs?

Added:

• The same problem exist when copying files, it hangsup between large files

• Similar problem exist when I tried to use TotalCommander (x64): copying paused at 80% of one of files, TC didn't hung up (but clicking cancel in copying dialog box doesn't have any effect). During this pause I can't kill TotalCmd.exe just like Explorer.exe

Added (2):

• This problem seems to disappear when I use 32 bit applications (like TotalCommander (x86) ), but I need to do more testing to be sure of this

Added (3):

• There are several errors in event log, source: disk, id: 11, qualifiers: 49156, task: 0, level: 2, keywords: 0x80000000000000
• (This may be important, and I forgot to mention this): Main disk is encrypted via Truecrypt (boot-in password)