Yesterday around noon, I noticed that KXOR had a weak signal and was suffering interference from an unidentifiable co-channel station. I also noticed the same thing last week. Typically, KXOR has a surprisingly strong signal in the Hillsboro area.
Since they just changed hands a month ago, somebody probably was running night time power (75 W) during the day either accidentally or as part of a new remote control installation or other maintenance work. It is perfectly legal to run night power during the day.