Today, after I continued to have the same issue, I ended up doing a full reinstall of the plugin. From settings, it’s possible to toggle “Remove all data when uninstall plugin” on. After removing the plugin and re-installing it, and re-configuring the feed, the issue has been resolved, for now. The feed works once again. However, I’m not very confident that it will keep working if the same situation happens for some reason.
I don’t recommend a full reinstall unless you really have to. The FB feed works now but Instagram stopped working… With the error message “Response code is 0. Body: Something went wrong. Please report issue.” –> I’ll try to toggle the Instagram feed on later after a few day’s delay, because it seems like there’s been issues with refreshing the feed too often (?) and sometimes just waiting seems to help.
TL;DR: Clean reinstall of the plugin solved this for me
