Subj works fine and stable until ipv6 server mode enabled for interface. Then router works, as expected for 30-40 min and reboots. My troubleshooting shows me something wrong with odhcpd very similar to memory leak. My setup is for MTS(Russia) extensively utilise ipv6 pd.
Firmware: RUTX_R_00.07.00 and issue was the same on previous one or two.