I have noticed a bug with combo ETH Miner v9.8 + AMD Blockchain Aug23 driver.
If miner looses connection to a pool, after reconnection hashrate significially drops.
Restarting the miner solves this problem.
Hasrate before reconnection to pool is ~156MH (26MH x 6 cards) and hashrate after reconnection is ~67MH (7, 11, 11, 7, 11, 18MH).
There was no such a problem with same miner and older drivers.

Claymore, I can send you the log, if it is neccessary.