My personal guess is that it`s tied to their sqlite db management, which might explain why logging stops after a while. Could be something wrong in how they purge old entries when the filesize reaches the threshold limit. Or, some people`s JFFS partition fills up before that threshold is reached.I've noticed Web History also stops recording after about a week time on AC86U router running Asuswrt 48260. There are some things to fix.