I haven't experienced any issues with a relaxer, I just always been into hair care. I did go into a pool and didn't wash my hair for a week, and lost lots of hair, but that is natural and relaxed issue, and I have also used MT and lost hair due to adding that to my hair and not needing it, again relaxer and natural issue.
But as far as hair breakage from a relaxer, no. Just xtra care, conditioners, conditioners, conditioners and low manipulation.
When I was younger I had a color issue, I would color my hair permanent colors every 2 weeks to once a month and it BURNED my hair out, but with bleaching my hair every two weeks it was waiting to happen, I was just having some fun, but never the relaxers for me.
I also wanted to add when I first started to relax I'd get a relaxer every 6 months. I now get a relaxer every 4 months. I don't consider 4 months a stretch it is just my natural time to relax. it helps to avoid over processed hair for me. I reevaluate my hair state every other shampoo, if my hair seems to change I tweek it immediately to avoid issues.
This year I have started going Sulfate free just as a new step for myself. I will see by the end of the year if this is for me. If not back to Sulfates otherwise this is my new thing!