Hi,
The rig is: 7x RX 480 8GB, MSI Gaming 5,  15.12 drivers, Win 10
For last several days I observe a new issue:
From time to time this rig will only run at less than 50% of the usual speed (drawing some 70% of the usual power)
This is does not depend on:
- miner (happens with Claymore's ZCash 9.2 and Claymore's CryptoNote 9.6)
- miner settings (like voltages)
- pool (happens with flypool and dwarfpool)

The strange thing is that I can restart the rig many times during an hour or so and the issue is still there. Then magically, without any modifications to the settings or HW, the miner launches at the full speed.

Has  anyone encountered such issue?

edit: When this happens GPU and MEM clocks behave normally that is they run at the max speed.