There was no reason. Just odd that they both only lasted that long. Have had people say they have had up to five ablations hope your husband stays in rhythm. I was on flecainide for7 years finally stopped working last April. For two weeks I was going in and out of a-fib cardioversion that didn't work. That's when they put me on amiodarone and have been on it for a year now. Unfortunately, I now am experiencing the toxic side effects thyroid is high have scars in my eyes and who knows what's next. See my heart doctor on May 6th we need to come up with a different plan. Hope all goes well with your husband.