When I restarted the macbook this morning, Bitcoin Core started again downloading the entire blockchain. I selected the right folder, I have an external SSD drive on which I previously already had downloaded the whole blockchain. Also I tried to click "reset options", but after restarting bitcoin core it again doesn't connect with the existing blockchain on the SSD drive but starts downloading from scratch. Does anyone have any ideas how to fix this?
Getting the logs may show some hints about the issue.
It's in your data directory, the file named "
debug.log", open it as text to view the contents.
For now, if it's an issue with pathing of data directory, you can set it again in the GUI by starting bitcoin-qt with
--choosedatadir command line option.
Or if you're using bitcoind, use
--datadir=<path to 'bitcoin' data directory> arg like instructed above.
Then if it started to resync again evena fter pointing to the correct directory, there may be issue with your blockchain, index or chainstate.
Such issue can only be seen in the logs. Telling us your previous settings may help as well.