Ok, to my feeling and experience most probably you have not enough Flash memory if you have such type of errors.

Then next step optimize Flash memory when you flash the box, recoving the Bad sectors on the Flash that could have been marked by error to Bad.

Go this way, flashing an image thru Web or via JapharFlasher, it has the Flash memory recovery function.

See : http://www.ourdreambox.com/ubbthreads.php?ubb=showflat&Number=3137#Post3137

Concerning the boxes, also be sure you use the correct image with sim compatible, as wrong drivers could get the box crashing as well (or badly patched images also behave the same way).

Concerning backups, you have scripts on this forum, and it's always better to use them (as the public packages are not reliable)... and backup must be done in/from the USB Memory stick or HDD.

Admin