Are you using the 4GB RX 5500XT or the 8GB variants?
Also use GPU-Z to check which Memory chip is installed in the GPU, Micron, Samsung?
Make sure your AMD driver is up to date in hiveOS.
Use different miners but I found Teamred miner to be the best for AMD GPUs.
Using TRM, latest and updated. 8Gig Micron. Tried Phoenix and NBminer same results. Anything above 890 on Memory it crashes.