Could be due to quick change of surrounding temperature (from inside to outside),but unlikely. Could be due to atmospheric conditions (high humidity), but unlikely.
Or, more likely, if it's never happened before, it COULD be water contamination of the oil.
Have you been in a downpour lately?
Have you washed it lately?
Just look at a sample of the oil, looks like something between Honey-Chocolate? No problem.
IF it looks kind of milky, change it NOW!
