MB8611 restarting several times per day

I saw some posts indicating there have been issues with the MB8611 in recent years, and was wondering if that was ever resolved, or if I just need to buy a new modem.

If anyone can share some insight, it would be appreciated.

Modem is on software version 8611-19.2.18.

Looking at the Internet Troubleshooting Tips post, and comparing against the modem connection info:

• Downstream power level is within the min/max values, except for one OFDM PLC channel (34)
• Downstream SNR exceeds the minimum 35dB, except for one OFDM PLC channel (34)
• Upstream power level is lower than the min value
• Upstream SNR is not shown
• 3 T3 timeouts in event log within the past 90 minutes
• We already had an Xfinity-initiated tech visit previously and all unnecessary splitters/amps have been disconnected
• We're paying for 1.3 Gbps, but Xfinity speed test consistently shows ~600-700 Mbps. However, I don't actually remember ever achieving real gigabit speeds on any speed test in the past...