[Samba] Excruciatingly slow logoffs from Windows XP/64

[Gary Dale]

I have multiple Windows 7 machines connecting to a Debian/Jessie server 
(4.1.17-Debian). They don't use active directory - never bothered 
converting (why look for trouble when the existing setup is working?) 
but do use roaming profiles. It takes them about 45 seconds to logon or 
off, which is acceptable.

I also have one XP/64 machine that takes a lot longer. Logons are fast 
but logging off takes about an hour.

When I log on with a local account, logging off is quick.

Any ideas on what the problem might be?