After updating the kernel from linux-image-4.9.0-15-amd64 on 06-24-2021 the system froze and become totally unresponsive multiple times within a few days.
No keyboard, sleep/wake, etc were available. Had to power cycle to restart.
Typical uptimes with the previous linux-image-4.9.0-15-amd64 were 2 months without issues.
No other software or alterations in the system were made.
I am using Devuan ASCII 64bit, kernel 4.9.0-15-amd64 / 4.9.0-16-amd64 and libc6 2.24-11+deb9u4.