Loki goes in spurts like this too. Some days he eats his food fine other days we have to sit with him or piece by piece it. We have figured out he is bored or knows that I won't leave till he eats his food all of it. Have to make sure for his meds sometimes I think he just wants the extra attention if it is a random thing I wouldn't worry to much if it becomes more common then you may want to call the vet
"If our dogs don't like you we probably won't either"