jock2 is right. As I tried to write in the first post, the v88mars has the dmc driver disabled so what you have done has no effect.
However in the last build I introduced a visual feedback (flashing of power led) when using the remote control. This is not only cute but also useful to understand if the box has frozen or not.
In fact, based on my experience, freezes can depend on an incorrect hardware configuration (too high frequency, voltage problems ... etc etc). But your crashes look like software, probably related to some particular case where kodi and the software stack in general fail.
Just to give you an example, I have an sftp folder linked to my nas. Kodi if the nas is turned off becomes slow/unstable, because it tries to connect to something that does not exist.
So what I can do is try to reproduce your problems and keep the software updated.
My suggestion is to try to understand if it may depend on some usb device connected, addon, .. etc etc
And post other logs (also with libreelec debug active). Maybe something comes from there too.