Since renewing the DHCP lease temporarily restores the connection, I would troubleshoot this as a possible network configuration or software conflict rather than immediately assuming the router is at fault.
1 - First, make sure macOS is fully updated, then forget and reconnect to the Wi-Fi network and temporarily turn off Private Wi-Fi Address for that network.
Apple provides guidance for Mac Wi-Fi connection problems, including checking for VPN or other security software that may interfere with network connections.
2 - If you are using a commercial VPN or third-party security, antivirus, firewall, network-filtering, or “internet protection” software, temporarily disable it and test the connection again. Apple specifically recommends checking VPN and other security software when troubleshooting Wi-Fi problems.
3 - When the disconnect occurs, check whether the Mac still has a valid IP address and whether renewing the DHCP lease immediately restores connectivity. Apple explains how to renew the DHCP lease on a Mac and notes that this can sometimes resolve connection issues.
4 - I would also test the Mac on another Wi-Fi network, such as a phone hotspot. If it remains connected there, the issue is more likely an interaction between the Mac and your home network. You can also check Apple's recommended Wi-Fi router and access point settings.
For the Private Wi-Fi Address setting, Apple provides instructions for changing it on a Mac. As a troubleshooting step, temporarily set it to Off for your home network and see whether the disconnects stop.
5 - Finally, while the problem is occurring, run Apple's Wireless Diagnostics by holding Option while clicking the Wi-Fi icon and selecting Open Wireless Diagnostics. Apple's Wi-Fi troubleshooting guide explains this process.
6 - If the Mac continues disconnecting from multiple Wi-Fi networks with VPN and third-party security software disabled, especially on a brand-new machine, I would contact Apple Support and have them run diagnostics to rule out a hardware or macOS issue.
