Hi,
After upgrading from 6.41.3, RB850Gx2 started rebooting in a loop, reseting did help but only after 4th time, and still wasn't able to restore from backup, restoring from backup it started rebooting again.
with 6.41.4 IPTV (multicast) traffic started glitching, I had to switch back to 6.41.3...