I know that Manjaro should be rock solid in terms of stability "if you use it out of box, don't change it too much and if you don't use many packages from AUR". I'd be more interested to know about your personal experiences with Manjaro in everyday use, and if you had some major hickups, what caused it?
Also, I'd like to know about some examples of which AUR packages should I be careful with and if I still have to use them - what to do in order to avoid major accidents. So far, whenever I had any issue with any of my packages from AUR, the package just stopped working as a worst case scenario. Luckily for me, those packages didn't destabilize Manjaro in any way.
Let me start with my personal "best moments" of the year:
nVidia driver update - Jump from 430 to 440 caused me a tiny litle heart-attack... or ten!
Can not Install/Update/Uninstall nvidia-driver
Not Manjaro's fault, totally nVidia's fault, but made my whole experience approx. 160% more nightmarish.
GRUB error after Windows 10 update (dual boot setup) - Broken bootloader/GRUB
Manjaro & Windows 10 dual-boot-system Grub broken after Windows update
It happened more than once and each time it was a pain. Real pain. I know we could only blame Microsoft for this, but I don't know if there's anything linux can do to prevent this from happening?
Manjaro stops at a message "Started TLP system startup/shutdown" - nVidia AGAIN!
Stuck at 'Started TLP system startup/shutdown.' - nvidia drivers
It's nVidia again. I had some other nVidia issues like screen flickering, caused by nvidia driver, but this one stopped loading Manjaro completely. It was also a mini-nightmare to get around it.
Even my list from above doesn't really include any issue caused by Manjaro, those were my biggest issues I faced so far in more than a year of using Manjaro. Note that even now I have more than 50 AUR packages installed and I heavily modified my DE, since I wanted to test the upper limits of this platform. I'm really looking forward to know what caused your biggest trauma, so we could all learn more about potential threats coming towards our way.