Hello
Recently built 2 rigs using this software. They are 6 AMD sapphire nitro+ rx580. No bios mod, overclocked enough to get 182 MH/s and no rejected shares. Using latest AMD drivers 19.6.2. The first one is working perfectly fine and mining properly with no problems, but the second one, despite having a good hashrate, is not very stable and crash after few hours (phoenixminer.exe stopped working). First one mining ETH and second one ETC. Anyone having any ideas why is this happening ?
current config.txt file (basically the same for the 2):

-pool eu1-etc.ethermine.org:4444
-wal XXXXXXXX.rig2
-proto 3
-cmd 2
-gt 12