Stable, robust and low-latency user-owned modem for 300/40 Mbps service ?

Hello, I'm looking to get a new low-latency and stable modem for my 300/40 Mbps service - and the key property of the modem I'm looking for is rock-solid stability with Xfinity's service, where I don't have to periodically reboot it or otherwise deal with it. Especially with my plan having no data cap, I might be using up to 2 - 3 TB of data per month. Therefore, with the 300 Mbps service, but with 2-3 TB of data use per month - which modem would you recommend based on your experience with your Xfinity-approved but user-owned modem ?

My current TP-link modem often starts having higher than normal latency (30 - 100 ms) after 3-4 days of use, after few 10's-100's gigabytes may have flowed through it. I then have to reboot it to restore the latency to 10-15 ms that it always gets with a freshly rebooted connection.

I will probably never go over gigabit speed for my service even if I upgrade my bandwidth above 300 Mbps. So I don't need high-bandwidth capable one - but instead need a robust one that doesn't degrade the service over time and after flow of data through it - and needing reboots.

Would appreciate experience-based recommendations ?