Yes. Exact same thing happens to my router. Single device in router mode - no mesh - wired side continues to function normally. Everything normally for 2-4 days after a reboot before the WiFi SSID...

@MatthieuSG - was your issue with the SSID disappearing/WiFi dropping ever resolved? You are not alone. I got mine from Costco as well in Dec. 2024 and set it up in Jan. 2025. I had 1 SSID configured...