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VDSL2 Connection Keeps Dropping

My connection stays up for several hours (sometimes even a few days), and then for period of about an hour, the VDSL2 link drops repeatedly, so for the next hour it might drop 10 times and then reconnect. Then it will be stable again for several hours (or even days), and then repeats [although it mostly seems to do this once per day]. Any ideas?

Example of log file for one event:

2023-01-17 08:39:39 syslog: [1687177.081000] Line 0: VDSL2 link down
2023-01-17 08:39:42 syslog: Clear IP addresses. IP connection DOWN.
2023-01-17 08:39:42 syslog: [1687179.450000] Line 0: xDSL G.994 training
2023-01-17 08:39:57 syslog: [1687194.459000] Line 0: VDSL G.993 started
2023-01-17 08:40:09 syslog: [1687206.648000] Line 0: VDSL2 link up, Bearer 0, us=19999, ds=79999
2023-01-17 08:40:09 syslog: [1687206.654000] Line 0: VDSL2 link up, Bearer 1, us=0, ds=0
2023-01-17 08:40:39 syslog: ptm0.1 - WAN link UP.
2023-01-17 08:40:39 syslog: Received valid DHCP lease from server. Connection UP.
2023-01-17 08:40:39 syslog: Connection Up. SNO/MAC/IP/SWVER/IPv6: [D15B229C008702/3C9EC7274FC8/]

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See this thread

FYI that I do not work for NOW, just a NOW customer trying to help