I think the person that may be able to answer this question the best is your probation officer because he/she, obviously, knows the specifics of your probation, the Court Order and the specifics of your crime/case.
The fact that they haven't violated you in 5 years is, obviously, a good thing.
First of all, you can only be found in violation of your probation if the judge finds that you have willfully failed to pay. We don't have debtor's prison. If no violation is alleged and then found, your probation will simply expire. The "victims" can get a civil judgment. The practical outcome for you is that you will not be able to get Penal Code section 1203.4 (expungment) relief because you did not successfully complete all the terms of your probation, specifically, the restitution order.
My California colleague is correct. You can only be held in violation of probation if you willfully failed to follow the terms of your sentence. In your situation it does not seem like you did.
ANDREW ROBERTS CRIMINAL AND TRAFFIC TICKET DEFENSE ATTORNEY
I suggest contacting your prior attorney to ask the court to terminate the payments. I have been successful in doing so for people in your position in the past, so it is difficult but not impossible. I wish you the best.
The response above is not intended as legal advice since it’s impracticable to provide thorough, accurate advice based upon the query without additional details. It is highly recommended that one should seek advice from a criminal defense attorney licensed in your jurisdiction by setting up a confidential meeting. Moreover, this response does not constitute the creation of an attorney-client relationship since this message is not a confidential communication because it was posted on a public website, thereby publicly disclosing the information, which is another reason to setup a confidential meeting with an attorney.