I got the wrong topic, that's what I meant to write about 386_52303. The firmware version 386_52303 was the one with the dual wan problem.
Also in version 3.0.0.4.386_52294 my bash scripts on cron stopped working. With curl requests. As long as you are connected via SSH, then cron works. As...
After the update RT-AX55, the dual network stopped working. Resetting the router did not help.
The dual network is configured for failback. After the reset, the dual-band configuration works for a while. After that, dhcp requests to the provider from Lan port 1 stopped being sent.
UPD...