I have 3 rigs + 1 PC computer with one card. Below is my configuration:

1. 6xRx 470 4GB (miner ver = 14.7)
2. 5xRx 480 4GB + 1x Rx 570 4GB (miner ver = 11.
3. 4xRx 570 4GB (miner ver = 14.5)
4. 1xRx 570 4GB (miner ver = 14.7)

today only rig 3 and PC (4) works normally. 1 and 2 hang/restart just after "setting epoch 280 done". After switching to ETH (epoch 272) they works normally (for now).

So my observation is:
Rx 470/480 4GB won't work on any Claymore up to 14.7 with epoch 280
Rx 570 4GB work normally on newest and older Claymore version with epoch 280

any solution for this for now? Or we should wait for new version of Claymore arrive?