Almost every day have an error "gpu0 devfee rejected share". What it means? Have 3-gtx 1060

you are right, it would be easier for everybody if the developer just put a default fee value which is not changeable... like in case of mining pools, everybody uses them, everybody pays the fees and nobody cries because of it...
everybody can see that this fee thing confuses the beginners... so I suggest to the developer to just remove it and use a standard global fee.

what's your stats? I hear gigabyte is not the best for oc'ing

Im having an issue where the miner stops out of nowhere.

It doesnt close or give me any errors it just stops.

Has anyone had this issue before and know a fix for it?

So far its happend once every 24 hours which is annoying since im losing out on many hours.

Here is a screenshot of when it happends

https://prnt.sc/fpoo6p

Compare the time in the miner to the time on my pc and you will see the difference

I am new to overclocking, so if I am reading my stats right:
2000Mhz core
10206Mhz Mem
1044mv Voltage

Possible issues: gigabyte engine? mem too fast (stock settings)? 

Maybe try MSI afterburner and see if they are the same, also afterburner is in my opinion the best for overclocking. MSi afterburner shows 5702 for me which is 11404 actual so you're losing a bit at memory clock which is key when mining Equihash(ZEC)

Also with these 1080ti's less voltage seems to give better performance much lower power consumption and thermals compared to more voltage so try lowering the voltage to 1000mv or under, you might need to lower your core clock also to keep it stable.

I'm using Win10 and what I did to prevent the miner from starting before MSI Afterburner did the GPU OC was to add this before my miner line:

TIMEOUTT 20NOBREAK

This will make the bat file wait 20 seconds before launching the miner.  If it takes 5 mins for your internet to come back up, you could put 300 sec delay in very easy...

 Why?

 There is no REAL value to a miner to waste the time setting up a SSL connection (it doesn't impact anything once it IS up, but it takes noticeably longer TO set up, which is one of my issues with Claymore in these days of pools getting DDOSed and going down for short periods on a frequent basis, AND his switching pools to do his "fee" stuff).

command sleep
wating the start of the script
If the Internet does not work, the script will close

It is necessary to make, that the script worked and did not close