Needle just gets stuck in a particular spot of the record ! What is going on?

Never experienced anything like that. I just bought this Japanese record, and though there are many hairlines it plays almost perfectly except for this spot. If you look at it while it's happenning the stylus moves back and forth endlessly and the same phrase keeps repeating forever without any noticeable distortion. I cannot see anything suspicious under a very strong light. The record is very clean, I cleaned it twice on a machine with Audio Intelligent three step system.
So what the hell is this? Groove wall damage? This is a Japanese record from seventies, I have a number of them from that time. That vinyl is excellent.