I'd very much like to get rid of these items but haven't figured out what caused them.

The name of the local computer in this case is: BREAKROOM and, apparently, that's where the computername of BREAKROMM$$ comes from.  There is no physical "remote device" then - in that context.

Also, I note that a large percentage of these failed logons are happening just after 12 noon.  Not all but most.

Any suggestions?