To me it looks like the SSD gets disconnected / unmounted. Usually a power supply issue.
Anyway, I too have a Pi4B with 4GB ram, original power supply, and an external (samsung) 1TB SSD - 2/3 full, but never experienced a problem.
ETA
My Pi is on 24/7, although I do restart it once every two or three months; I switch it off only if I happen to be away from home for more that two days.
Anyway, I too have a Pi4B with 4GB ram, original power supply, and an external (samsung) 1TB SSD - 2/3 full, but never experienced a problem.
ETA
My Pi is on 24/7, although I do restart it once every two or three months; I switch it off only if I happen to be away from home for more that two days.
