I've been mining successfully using Claymore's Dual Ethereum AMD+NVIDIA GPU Miner v9.5  on Windows 10 using 2x480 4gb cards.  The last two days Ive been getting an error the "DAG file (epoch# 129) creation failed" and "open cl error cannot write big buffer with dag"

Here are the options I've been running it with:
-epool us1.ethpool.org:3333 -ewal 0x0eaccc7749599bccd3b91a41afd51f9f45f895e8.riglediggle3 -epsw x -dpool http://dcr.pool.mn:4722 -dwal lilbit.1 -dpsw 1

This system has been running fine for months, so I'm assuming things were broken by a hardware failure or windows update.  Any other options?