A buddy of mine, avid rider, but not super fast, has broken every suspension frame he's owned, usually in a pretty short time. The fastest he ever went won him a KOM on a local trail, mainly a downhill, and he did it with a broken swingarm before he realized it was broken.
The frames he broke were all aluminum, BTW. He's between suspension bikes now and riding a decades old rigid frame.

I am in a similar boat - I broke every steel MTB frame I have ever owned within two years of purchase - GT, Concorde, and Norco. THe manufacturers considered these frames 'under warranty' and I got replacements. I have never broken an aluminum MTB frame (GT, Kona), and my Ti frame broke after ~20 years - a crack that started from the deep gouge in the seatstay caused by chain suck.

The moral of the story Is - if you are pushing your equipment hard, failures might happen. Feed your piggy bank when you can so you have a few shekels saved up when you need to replace something, and regularly give your bikes a close inspection to minimize the chance of setting out on an 18 hour unsupported epic with a head tube about to separate from the frame.