When I anneal System 96 I
When I anneal System 96 I always go to 950 for at least 45 min, then 150 ramp to 800 and hold for 10 min. Then I ramp to room temp at a 250 rate. Breaking days after definately sounds like an improper anneal. If it is a continual problem, you might want to get some polarized sheets so you can inspect the pieces for weak spots and fix them with another annealing cycle.