Hello, I can't mine ETC after 350 epoch by
Claymore 15.0 
My Hash Rate is 1-1.5 mhs (RX470 4GB)
PhoenixMiner 5.0b works perfectly, but Claymore does not work. Any ideas ?

Hello !
1. Switch to iGPU if exists.
or
2. Put GPU with more VRAM in 1st slot (GPU0)
or
3. Use PM
P.S. Its bkz OS eats VRAM from first GPU ( about 350Mb) so present DAG file cant suite to VRAM.
Point 1. and 2. can make you run until 353-th epoch. Point 3. can make you run until 373-th epoch.