Intermittent packet loss throughout the day, only one upstream channel bonded

In the past week, I've noticed that I've been having a lot of packet loss, which I'm pretty sure is outbound. I sit in voice calls a lot as I work from home and I notice no interruption to other's speaking but other's notice me. It's also apparent while gaming online as everything will halt for ~10 seconds every 5 to 60 minutes, sometimes more often.

I decided to look into my modem's management page(s) and noticed that I only had 1 upstream channel bonded, and what I've found online says I should have 3 or 4. For the downstream channels, the 24 expected are connected and within expected levels. But that 1 upstream channel I have is at 55.50 dBmV, which doesn't seem too swell going off what I've also read on that.

Here's a screenshot of what it looks like on my end. The modem I have is an Arris TG1682G. I went outside and did a minor inspection of the cable running to the modem, and it seems to be direct as I cannot see any splitters. But I'm about to go outside again as it's lighter out, and the cable runs on my garage roof.

If there's any more information I can provide, do ask. Thanks!