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I am using a raspberry pi 3 with a HDD, incl Electrum Personal Server and Joinmarket and have no problems with it. This is the guide I followed: https://stadicus.github.io/RaspiBolt/
I'm not really familiar with the nuts and bolts of Mynode/Raspis, so the only thing I can recommend here is to open a detailed description of your problem on Mynode's Github: https://github.com/mynodebtc/mynode/issues, I think the chances of getting a good reply are much higher there.
https://bitcointreasuries.org/ I posted here a summary and my takes on ARK-investment bitcoin research, you can also download it in pdf here.