Mister Micawber and HaraKiriBlade, thank you for your reply!
>[fix] pairs better with 'something goes wrong' part of the sentence
I've learned that combination of words (or cooccurrence restriction?) should be taken into account when speaking or writing English.
BTW, now I'm interested in a formal sentence which pairs with 'repair' in the context.
For example, I changed 'something goes wrong with' part of the sentence this way.
'If there is a technical problem with a robot, it would cost the company so much money and time to repair it.'
or
'If a robot has a technical problem, it would cost the company so much money and time to repair it.'
I guess 'a technical problem' sounds more formal than 'something goes wrong with'.
Thank you.