I have disabled zram, as it was suggested by someone on Reddit. I am now running the latest kernel, but absolutely no kernel in my history of this thing has been stable. I got the following serial console the last time it crashed (But could not edit my post due to limits): ...
on-finished "~2.3.0" parseurl "~1.3.3" path-to-regexp "0.1.7" proxy-addr "~2.0.5" qs "6.7.0" range-parser "~1.2.1" safe-buffer "5.1.2" send "0.17.1" serve-static "1.14.1" setprototypeof "1.1.1"