Modem Keeps Dropping From Docsis 3.1 to 3.0, Causing Major Packet Loss

I purchased an Arris SB8200 this past July because my old modem kept resetting itself. The SB8200 worked perfectly up until a month or so ago, but then I started to notice my streaming, gaming and other internet services were starting to lag or stop working completely. The "lag" (mainly packet loss) occurs when my modem is pushed out of docsis 3.1 into 3.0. The packet loss goes on for about 10 seconds as this process takes place. The modem will then stay in docsis 3.0 for varied times (10, 20, 30 minutes etc.) before trying to reconnect to the 3.1. When it does switch back to 3.1, there is no noticeable lag or packet loss. Unplugging and resetting the modem has not worked. A support agent sent "refreshing signals" yesterday to the modem but that has not worked either. A technician was out to check my outdoor connections in June (2023) and saw nothing wrong. I am at a loss when it comes what to do next.

I have seen other people have the same docsis problem I am having. They tried replacing the modem with other brands and even tried Xfinity's Gateway modems, but this did not seem to fix the issue for them. (Modem switching between DOCSIS 3.1 and 3.0, causing brief packet loss/network drop outs : Comcast_Xfinity (reddit.com) The link will take you to a conversation another customer had on reddit about the issue. They ultimately purchased a modem that only supported docsis 3.0, but still receive slight packet loss. 

I don't believe the modem is the main problem, as it was working fine for a long time. Looking for other suggestions to fix the problem, because the laggy service is becoming rather annoying.