Sorry this is happening. I did a quick test and I can't duplicate this issue, so I have a few questions so I can try to duplicate it with your settings:
* What device are you on, how much available storage is on it, and what version of iOS are you running?
* Is this the Crosshatch brush in the default set (Comics) or is it a Crosshatch brush from one of Kyle's brush packs? If it's from an imported brush pack, which one?
* What size is your document?
* What size is the brush?
Let me know and I can do a bit of testing.