Thanks for your reply.
Just after posting here, I received replies to the crash issue, and possibly the speed issue (running only as fast as the OEM drive).
Regarding crashing, tech support said:
This is a known issue that occurs when using NVMe SSDs with some MacBooks. However, you can circumvent this issue using the following steps. This will still allow for regular sleep, just not deep “hibernation” mode.
1. Open up Terminal (open your Applications folder, then open the Utilities folder. Open the Terminal application.)
2. Type in the following code in the Terminal:
sudo pmset hibernatemode 0 standby 0 autopoweroff 0
3. Press enter (return).
I just powered off and back on, and slept and woke the laptop with no issues. I suppose this is a fair tradeoff.
To answer your questions
- I had Mojave on the old drive.
- not sure of your second question, but I used CarbonCopyCloner to backup, installed the Feather, booted from the CCC backup and restored to the Feather.
- No, I haven’t.
Regarding the speed issue
I suppose I’ll reinstall the OEM drive, (re)install Mojave on it, then reinstall the Feather drive. This should patch the firmware and speed up the drive (hopefully). I would think this would be available in System Report, but apparently not.