Sock had levelled the match by winning the second set before Raonic's long comfort break, which prompted the Bercy crowd to boo the Canadian when he returned to court.
"Whoever the escort who took me was, took me into a bathroom that had no seats on the toilet," the seventh-seeded Raonic, who won 6-3 5-7 7-6(4) explained.
"So I didn't want to squat, so I kept saying, 'let's go to another one', and we ended up going to the locker room."
Raonic still has a chance of qualifying for next month's ATP World Tour finals in London, for which four spots are up for grabs in Paris.
(Reporting by Julien Pretot; Editing by Mark Meadows)
