I'd like to avoid using Net Use

[tester_V]

Thank you, I've seen the post before.
I have about 12-35 remote systems to access (need to copy files)and sometimes "Net Use" produces an error and I cannot copy some of the files. Maybe I should increase sleep time? Not sure.
Here is the code I'm using:

    subprocess.call("net use Y: /delete /yes")
    time.sleep(10)
    subprocess.call("net use Y:"+"\\\\"+itm+"\\c$ /user:domain/xxxUSER somepass")

the script copies files but produces this error
Error:
More help is available by typing NET HELPMSG 2250.
System error 67 has occurred.

Thank you.

The network name cannot be found.