Gigablast upload regularly dropping to 1.23Mbps, downloads range from 25Mbps up to 600Mbps. 10-15% packet loss off and on

I've been having intermittent problems over a year with packet loss and speeds. I was also having lots of uncorrectables but a tech came out last year, said they found something upstream and improved the situation. Still some packet loss and uncorrectables but not as bad. I was of course still charged the repair fee despite it being their issue and had to call to get that removed.

Although the situation was better it was still fairly bad so I bought a new cable modem, the Netgear CM1000, which somewhat improved the situation further, with reduced packet loss and uncorrectables. It's still not perfect like it used to be for 10 years up until a year ago.

A few weeks ago speeds began intermittently dropping to trash. Packet loss slightly increased. Occassionally I see massive spikes of uncorrectables but not often.

Sometimes it's slow download, sometimes slow upload, sometimes both. Sometimes speeds are okay besides packet loss.

As I write this I'm getting 445Mbps down, 1.23Mbps up. On Gigablast ("up to" 940Mbps down, 35Mbps up). Earlier in the day I was getting about 100Mbps down but 31Mbps up until afternoon.

Here's my cable modem about 30min after rebooting it to see if that helped (it did not).

Today's logs (replaced MAC addresses with xxx):

2021-04-15, 20:19:42 Warning (5) Dynamic Range Window violation
2021-04-15, 20:19:42 Warning (5) RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=xxx;CMTS-MAC=xxx;CM-QOS=1.1;CM-VER=3.1;
2021-04-15, 20:19:42 Warning (5) Dynamic Range Window violation
2021-04-15, 20:19:42 Warning (5) RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=xxx;CMTS-MAC=xxx;CM-QOS=1.1;CM-VER=3.1;
2021-04-15, 20:19:42 Warning (5) Dynamic Range Window violation
2021-04-15, 20:19:42 Warning (5) RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=xxx;CMTS-MAC=xxx;CM-QOS=1.1;CM-VER=3.1;
2021-04-15, 20:19:41 Warning (5) Dynamic Range Window violation
2021-04-15, 20:19:41 Warning (5) RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-MAC=xxx;CMTS-MAC=xxx;CM-QOS=1.1;CM-VER=3.1;
2021-04-15, 20:19:36 Notice (6) DS profile assignment change. DS Chan ID: 32; Previous Profile: ; New Profile: 2 3.;CM-MAC=xxx;CMTS-MAC=xxx;CM-QOS=1.1;CM-VER=3.1;
2021-04-15, 20:19:31 Notice (6) TLV-11 - unrecognized OID;CM-MAC=xxx;CMTS-MAC=xxx;CM-QOS=1.1;CM-VER=3.1;
2021-04-15, 20:19:31 Warning (5) DHCP WARNING - Non-critical field invalid in response ;CM-MAC=xxx;CMTS-MAC=xxx;CM-QOS=1.1;CM-VER=3.1;

Netgear CM1000