Jojo,
It sounds like the computer's connectivity to the domain may be questionable. Try removing the computer from the Domain, purging the local (roaming) user profiles, then adding the machine back into the domain. Let the user login to create the new roaming profile on the machine and see if it resolves the issue. You may need to re-image this one machine again, if that doesn't fix it. Is this PC possible a different model than the others you recently imaged?