I bought a '''2015 MP Pro''' in August of 2018, and immediately replaced the 128GB drive with '''1.0TB OWC Aura Pro X''' (I could not find a new 2015 MP Pro with a larger drive''')'''
Currently on Mojave (10.14.6)
I have same issue: suddenly the computer slows down a lot, then the screen starts to flicker, getting worse and worse, shut down takes a very long time.
It had been happening every 4-6 weeks, but it happened 3 times in past 4 days.
All of the panic logs show something like as shown below, with '''IONVMeController''' mentioned.
Way back I contacted OWC and they sent me a new drive which I replaced. It did not fix it, but I had been living with the “every 4-6 weeks” crash situation.
I had P'''ower Nap''' turned off. I just now turned off '''wake for network access'''. I have not yet done this: disabled standby from the terminal ("'''sudo pmset standby 0'''"). Headed to Genius Bar today and will see what they say.
I also freed up room on the drive, it had 30GB free now it has 200GB free .
I do not have drive encryption on, thinking that might make it worse and originally thought that might be part of the problem.
Typical panic report:
Tue Dec 3 15:32:00 2019
* Panic Report ***
panic(cpu 6 caller 0xffffff7fa174ab30): nvme: "Fatal error occurred. CSTS=0xffffffff US[1]=0x0 US[0]=0xf VID/DID=0x2260126f
. FW Revision=C2.3.23A\n"@/BuildRoot/Library/Caches/com.apple.xbs/Sources/IONVMeFamily/IONVMeFamily-387.270.1/'''IONVMeController'''.cpp:5334