What cards and settings are you using?
Are you monitoring errors with hwinfo?

worked once. asa a reboot was made hashrate dropped from 375 to 320. Already tried everything. When claymore tries to install driver after disabling test mode windows pops up a warning about unsigned driver installation. After reboot windows start in test mode so its supposed that driver was successfully installed but then the same hashrate.

heres my config file

-asm 2
-gser 1
-tt 60
-ttli 65
-wd 0
-cclock 1150
-y 1
-mode 1
-dbg -1
-powlim 20
-strap 5@2040,1@1900,1@1750,5@2000,1@1750,1@2000,1@1930,5@2000,2@1850,1@1850,1@1750,1@1900,1@2000
-rxboost 1
-cvddc 875,875,875,875,875,900,875,900,850,875,850,800,875
-mvddc 875,875,875,875,875,900,875,900,850,875,850,800,875

when i found that voltages values i figured out that somehow core voltage and memory voltage were linked so if i decrease core without also decreasing memory voltage it wont work. do you face the same behavior?

I'm facing a really weird issue. secure boot is disabled and test mode enabled. widows keep blocking claymore driver install. sometimes it installs but asa i restart windows straps revert to stock and even claymore shows that timings is applied hashrate is the same when using stock straps. tried ddu, fresh windows, at least tree driver versions but issue remain. my rig has 13 Polaris cards mixed vendors and versions.