Thx! And yes must be some error handling going wrong. On that link the error is slightly different though.
I do think the original fault is hopefully gone, because when testing out usteer i followed [OpenWrt Wiki] Setting up usteer and band-steering in OpenWrt. That mentioned putting the time_zone to GMT0. I did that because i though that was required, but that did not work (as I indicated above), but it got me thinking that the actualy error maybe its related to that. So instead of GMT0 I put in the exact string of /etc/TZ. Seems to be ok now, although would be good if that error handling bug gets fixed as crashing the whole wireless is a bit drastic.