What can be doing to fix it?
Cloudflare was out this morning for some time and that affected my ability to get to several websites, including Nanopool. Have you considered that the internet doesn't work 100% of the time?
Sure this can be a reason, but while Claymoore fallen to nofee mode and mining "normally", I can browse the web, and Claymoore never do not go back to devfee mode.
I make some like workaround - assigning minimum speed to 2-3% lower then normal, so Claymoore restarts compleatly and works fine then.
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Probably connection is not good sometimes, or DNS do not respond and Claymoore can't find DevFee pool.