Hi guys

I'm getting a weird error when mining ravencoin (kawpow)

So after a few hours the miner crashes (but gpu doesn't crash)

Error messages from log:

GPU 0 ERROR - failed to allocate ethash dag buffer
GPU 0 thread exiting with error.
Watchdog detected all worker threads have exited, shutting down.
Shutting down...
Watchdog thread exiting.
Successful clean shutdown.


Why am I getting ethash dag buffer error if mining kawpow?

This happens with both an rx 570 4GB, and rx 470 4GB card in separate rigs

My bat tile is the standard .bat found with my wallet and pool added plus the logging option

Not sure how to resolve this?
Please advise

Thanks