when accessing shares on my Win7 PC (smb2) I consistently had a session timeout problem (I guess, didn't check the specifics).
Symptom: I log in to a share, exchange some files, then do something else on Android (while still logged on in the background, I presume). On switching back to Total Commander & hitting "refresh" (or copying some more files, or attempting to change directories) TC pops up its little progress window with some message ... and we wait ... and wait ... until finally - error, I don't remember which.
All it took to get around this was to close TC (X in the top right corner) after it had finished its first task, and log in again for the next task a few minutes later, rinse and repeat. No problem then.
Unfortunately, this Windows machine has just died (the true death, heartware failure), so it can't provide further details.
