Try change the "RestrictPreferenceCaching" parameter in the anyconnectlocalpolicy.xml file
Credentials—The user name and second user name are not cached. <--try this..
Thumbprints—The client and server certificate thumbprints are not cached.
CredentialsAndThumbprints—Certificate thumbprints and user names are not cached
All—No automatic preferences are cached.
false—All preferences are written to disk