Hi,
Same thing has been happening to me for the past few weeks. Crashs are becoming more and more frequent though. 2x times last night, once again earlier today.
I've switched to a brand new SD card, crashs still occur.
Neither atop, nor top, nor the logs (I even deactivated the ram logging in order to have the logs stored on SD) show me anything useful.
The NAS becomes unresponsive, both on the network, and both on the serial port. The power LED is ON and the disk activity LEDS either are all lit up or all off but most of the time they are OFF.
The network (RJ45 port) LED are still blinking tho.
The OLED remains visible without being updated and the fan remains quiet.
Can it be a power adapter issue? It's only a few months old, previous one died and I had to order a new one from Kobol.
Edit : it might have been a dust issue. I've just opened the case and cleaned a bunch of dust. So far so good, I hope it was just this. Fingers crossed.
Edit2 : nope, issue still occurs I'll try with another PSU