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.
The Micron 5500XT are less performing out of the other RX5500XT, I guess no one told you that before buying, the higher I have seen is 27MH sorry pal
1150 core
950 memory
= 27MH on ETH
If yours cant get over 890 then its your luck....