I had to reboot my modem last day and to be sure I rebooted the router as well. I've watched the router and it was in fact rebooting 3 times but the 2.4Ghz radio LED remainded on during the reboots and the 5Ghz LED stayed off as it was configured as administratively shutdown. After the 3 reboots, within a minute, also the 2.4Ghz radio shut down and that's it. Waited for more then an hour but still remained to be shut down. Also I noticed that the date/time was not set to the correct date/time, it was set as if it was initialized for the first time. The only way to solve this was to go to "Administration" -> "System"-page and just click the "Apply"-button. Within +/- 10 seconds, the 2.4Ghz radio turned back on again and the date/time was also set correctly. So, I guess I have an additional problem.... But am I the only one having this issue?
PS: Apologies for the late response on your answer....
Looks like you have a radio schedule configured on the Wireless -> Professional page. Since your router fails to properly set its clock when it connects to the Internet, that causes issues with the radio schedule.
I've seen a few reports of NTP issues, but so far have been unable to reproduce them here. I suspect the issue might not happen if your WAN interface is DHCP, only with other connection types (like PPPoE perhaps).
If running Asuswrt-Merlin, you could probably work around the issue by having a wan-start user script manually update your clock once the WAN interface comes up:
#!/bin/sh
sleep 10
ntpclient -h time.nrc.ca -s