Upgraded to 5.7b, kept all the same settings and flags but got a crash within an hour of using it. Using latest Win 10 and June AMD drivers. Nothing interesting coming from the logfiles.
I'm using 7 x RX 6800's.
Will try again using July AMD driver.
I have the Rx 6800 XT which are almost the same and they are really one of the most problematic cards for mining at least in Windows,as I haven't tried them in Linux.The only option I used and kept them running for a few days with Phoenix miner 5.6d was to use a larger -eres option usually -eres 6-8 which can not be affected by DAG recreation as this is the main issue with Rx 6800 cards,they have 16 GB of memory so with this I have been able to run stable for a week at max.
The real problem with such cards that even AMD itself does not really produce that good drivers for them,at least this is what I see because every driver I try it is always the same problem.