Unfortunately (or fortunately?) I have always been using these roms in a multirom environment, so I couldn't test them as main installations. However, that shouldn't make any difference.
If you can and will, please try to install it with multirom. (Multirom has many benefits, I think.) If this doesn't work in multirom either, I think there should be something wrong with the device itself.
I am unaware of how we can track these down. Probably dmesg and journalctl can give you more about the issues but I am not really good at fixing issues by those logs (well, it depends on the issue). However, if you post some logs here (copy them into pastebin or somewhere else and only post the url here), probably there will be somebody who can help you out.