It happens on all miners with the 5700 and old HiveOS version...
Install HiveOS with Kernel 5.4.0-hiveos #108, as I see you have a very old Driver AMD 20.20 the most stable is 20.40 that hasn't go a memory bug lead with the 5700xt.
If you take the last image realase of update inside HiveOS you will avoid that Free Ram that you have :-)
It was solved on this realease:
0.6-190linux
2021-01-08
LINUX SYSTEM IMAGE
New Stable branch
Hive Linux client: v0.6-190@201106
Universal boot mode: BIOS | UEFI
Linux kernel: v5.4.80-hiveos
Drivers version: AMD v20.40, Nvidia: v455.45.01
Universal image with "support from the box" AMD Polaris/Vega/Navi and Nvidia 10xx/16xx/20xx/30xx
Its not possible, i was using TRM for at least 3-4 months and after that 1 month PM without any memory problems. It started when i changed to lolMiner.
And if i change back to TRM, there is no problem with memory. It shows 6.6gb free ram all the time. (And if you havent noticed its RAM not VRAM)
(5.8gb now :-) )
But i can try to update that driver when i visit the mining site. Last time i tried 20.4, it didnt work, cant remember which card didn't show up.
and thanks for advice.
Driver 20.20 has a memory leak... is not miner depence. Just update and you will have all solved... but update your complete image to 5.4.0-hiveos #108 the last avaliable in website. You will continue having all the same copying the rig.conf ☺
Updated driver to 20.40 and it broke everything, no OC or fan control on RX5600 and RX5700 -> Big problems with over heating... Now back at 20.20, everything working again, added auto restart every week for miner so no more problem
With 20.20 also hashrate higher and lower power consumption on RX570 and RX580.
I hope you update the image of HiveOS soon as I said you
then all will go perfectly ... meanwhile you will continue having the autoreboot when free memory ends...
Now i updated to new image and everything is working well, thank you. Also noticed on same visit rx570 fan was failing. Bad quality fan from XFX, only 6 months old and already failing.
I also Tested lolMiner, TRM and PM for hashrates. (2xRX580,RX5700,RX5600,RX570.)
lolMiner gives total 183Mh/s
TRM gives total 186Mh/s thanks to RX5700 which gives 56Mh/s vs lolMiner 53Mh/s.
PM gives total 186Mh/s thanks to better hash on Polaris (RX580/RX570), 31Mh/s vs 30Mh/s. I know that PM is said to cheat on Hashrate and also uses little bit more power.
--> No big difference between miners...