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My small Seb has no side to side blade play.
Question, did you by chance disassemble it and pinch one of the washers during reassemby? If this was the case, you would have noticed that it does not open/close very smoothly and the blade may be slightly off-center in the closed position.
This might not be the case at all, just thought I'd throw it out there. You might try disassemby and reassembly a time or two with a good lubing and see if there's any improvement. Lube has a way of absorbing some of that "micro-slop" between washers, blade, and bushing.
Good luck in any case. I hate to hear about a sick Seb.
Professor.
Send it in. It will be hard to carry another knife for two weeks, but they will take care of you.