installed the latest driver and latest APP SDK.
And another problem.
The syslog errors are continuously
[ 7669.222221] amdgpu 0000:06:00.0: GPU fault detected: 147 0x0d608401
[ 7669.222222] amdgpu 0000:06:00.0: VM_CONTEXT1_PROTECTION_FAULT_ADDR 0x081047AC
[ 7669.222223] amdgpu 0000:06:00.0: VM_CONTEXT1_PROTECTION_FAULT_STATUS 0x0E084001
[ 7669.222224] VM fault (0x01, vmid 7) at page 135284652, read from 'TC7' (0x54433700) (132)
Linux is a problem, always.
Well, it seems AMD does not support ADL v10 in Linux yet. In Windows it works fine. I will build a system with Ubuntu with latest drivers and RX480 to confirm it.
"VM_CONTEXT1_PROTECTION_FAULT_ADDR" error - not sure that it is a problem of miner, it can be issue in drivers. What Linux version? What drivers version? I tried to reproduce it but it seems I'm doing something wrong.
Please keep supporting Linux version

, the driver is still in beta so I'll patiently wait
There is no libatiadlxx.so when using amdgpu pro driver, so I guess they release ADLv10 but not merge it with the driver yet.
I myself use Ubuntu 16.04.1, driver version amdgpu-pro_16.30.3-315407.tar.xz ( this is last month version, I think before ADLv10 release ), try on both stock kernel 4.4 and 4.7 ( not the latest 4.7 kernel ), maybe 4.8 will be better
Then check on /var/log/syslog or journalctl when running claymore an you'll see above error.
The mining works ok anyway, but the syslog is bad "too many write" We can disable syslog to protect hdd.
It looks like a driver problem, but perhaps you can find more
P.S It's easier to find whether your GPU is faulty or not on Linux then Windows ( Windows just directly go to BSOD or recovery with no log ), I personally think Windows is overkill for mining
I have this exact same issue, causes CPU to be tagged to 100% from all the error logging.