Best thing would be to avoid this. I had it happen a couple of times for no apparent reason and started paying more attention to what is going on. I might have found a solution, for me at least. Every once in a while I was getting a slight overrun, not a backlash, and as it wasn't so bad I just started reeling. I did notice a slight little loop that was getting line reeled in over it. My thought was that this would crimp or weaken the line. Now I pull out even the slightest little overrun, even if its only a couple inches and have had no deep breakoffs since. This has happened to me with co-polymer also but not any more. Don't use mono so can't speak to that.