I am still experiencing the problem. I've upgraded drivers several times and chose clean install. From researching it seems the problem is caused in Win 10 by not having the 'Creators Update' version, however this problem started right after Win 10 was updated to that version.
In Nvidia Control panel I have Power mgmt mode set to Prefer max performance. If I set Optimize computer performance to on, Claymore spits out the 'cannot allocate big buffer for dag' error when starting.
Anybody have any other suggestions to get Claymore working properly again?
What version of windows 10 you've installed, suggested version is 1703, you may check control panel/system/about if you have Windows version 1703
Some users make it stable on these setups, A clean Windows install+FCU, AMD 17.11.2 and Claymore's miner