Well, it was an older mast, so I guess it just got to the end of it's life cycle.
Unusual for a 30%. Most of them are reinforced from the base to the boom
How the heck did you get used to such a heavy 490 cm mast.
I hope you are planning to replace it wth at least a 75% carbon mast.
Should save several pounds in weight.
If sure you will notice the difference immediately and you will like it I'm pretty
Hope this helps,