Did you try an usb 2.0 port? on my pc's its more stable than usb 3.x ports
BTW i switched to linux from win10, man this is stable. Can advise any1 to do the same.
I will try a usb 2.0 - I cannot switch to linux unfortunately - not without buying a second pc - there are too many things I run on this one that do not work in linux.
Not sure what pool you're using but if it's not ASICBoost-enabled your speed will be limited to ~575MHz max due to USB traffic.
Is it trying to run faster than 550 and then throttling down? Or does it initially target to 550 no matter what you put in the command line? Because that could be an issue with a config file overriding command line specs.
I have tried a few pools - I tried Nicehash because when it does mine there, it is actually quite profitable - almost 50 cents a day lol I have mined on poolin it makes about 16 cents a day there Mostly I solo mine with it on ck solo pool.
it does try to run at 630 (I have the freq set to that) and on setting 6 for the voltage it will do it for a few hours but after a day or so its back down to 550
this is my current line for ck's solo pool:
cgminer.exe -o stratum+tcp://solo.ckpool.org:3333 -u 3PpMnscq3mj8ACsDdPbPgFhtoSzz1LybYC -p x --api-listen --api-allow W:0/0 --gekko-r606-freq 630