Security events associated with for MSOL account

I am seeing alot of activity in the events log associated with the MSOL_xxxxx account especially off hours.  Is this normal or should I be looking for a cause?   The event logs samples are below.  

Security: A Kerberos authentication ticket (TGT) was requested.
Security: A Kerberos service ticket was requested.
Security: A logon was attempted using explicit credentials.
Security: An account was successfully logged on.
Security: An account was logged off.
Security: A Kerberos authentication ticket (TGT) was requested.
Security: A Kerberos service ticket was requested.
Security: A logon was attempted using explicit credentials.
Security: An account was successfully logged on.
Security: An account was logged off.

Security: An account was successfully logged on.
Security: An operation was performed on an object.
Security: An operation was performed on an object.
Security: An operation was performed on an object.
Security: A Kerberos service ticket was requested.
Security: A logon was attempted using explicit credentials.
Security: An account was successfully logged on.
Security: An account was logged off.
Security: Special privileges assigned to new logon.
Security: An account was successfully logged on.
Security: An account was logged off.
Security: Special privileges assigned to new logon.
Security: An account was successfully logged on.