Possibly. Many users have reported slow speeds, and ISPs have confirmed they are working on firmware fixes. However, you should also try basic troubleshooting like restarting the modem.
What is currently displayed in your dashboard? Who is your internet service provider ? What specific error or behavior is the router exhibiting? sagemcom fast 5866t firmware update
Your ISP (e.g., Optus) manages the firmware distribution. They test the software heavily on their specific 5G network infrastructure before pushing it out to consumers. Scheduled Maintenance Windows Possibly