Per Tom's answer of Corrupt station memory...
You mentioned issue began at " 3 A.M.  the other morning" Daylight Saving
Time in most of the US began on Sunday, March 14, 2021 at 2:00 A.M wonder
if some weird issue may have happen due when your system clock jumping
forward. Note that normally WeeWX handles this just fine :)

On Wed, Mar 17, 2021 at 9:19 AM Tom Keffer <tkef...@gmail.com> wrote:

> No need. This is pretty clearly a case of memory corruption on the logger.
> The clue is
>
> Mar 16 07:04:29 pvweatherbox weewx[7369] DEBUG weewx.drivers.vantage:
> Retrieving 513 page(s); starting index= 1
> Mar 16 07:04:29 pvweatherbox weewx[7369] DEBUG weewx.drivers.vantage:
> DMPAFT complete: page timestamp 2021-02-26 11:30:00 PST (1614367800) less
> than final timestamp 2021-03-14 03:00:00 PDT (1615716000)
>
> It asks for 513 pages, then proceeds to get ... nothing.
>
> See the section *Corrupt station memory
> <https://github.com/weewx/weewx/wiki/Troubleshooting-the-Davis-Vantage-station#corrupt-station-memory>*
>  for
> how to clear the logger.
>
> -tk
>
> On Tue, Mar 16, 2021 at 2:17 PM gjr80 <gjroder...@gmail.com> wrote:
>
>> Hi,
>>
>> I suggest you edit weewx.conf, set debug = 2, save weewx.conf and restart
>> WeeWX. Let WeeWX run for a few archive periods and then take an extract
>> from the log covering the entire WeeWX startup through until the few
>> archive periods have passed. It’s important to get the entire startup
>> sequence as it has important config info. Post the log extract here and we
>> can see exactly what is (or is not) happening. If you need help obtaining
>> and posting the log extract you might find the Help! posting to
>> weewx-user
>> <https://github.com/weewx/weewx/wiki/Help!-Posting-to-weewx-user> wiki
>> article helpful.
>>
>> Gary
>> On Wednesday, 17 March 2021 at 00:10:30 UTC+10 ksmol...@gmail.com wrote:
>>
>>> After years and years, at 3am the other morning my Vantage Pro stopped
>>> posting to CWOP.    I've done all the usual, reboot PC, replace the
>>> USB-Serial cable, still nothing.   Not sure how else to troubleshoot, the
>>> logs "look like" it's reading data from the unit.   Any help appreciated.
>>>
>>> Mar 16 07:04:27 pvweatherbox weewx[7369] INFO __main__: Starting up
>>> weewx version 4.1.0
>>> Mar 16 07:04:27 pvweatherbox weewx[7369] DEBUG weewx.manager: Daily
>>> summary version is 2.0
>>> Mar 16 07:04:27 pvweatherbox weewx[7369] DEBUG weewx.drivers.vantage:
>>> Gentle wake up of console successful
>>> Mar 16 07:04:27 pvweatherbox weewx[7369] INFO weewx.engine: Clock error
>>> is 0.13 seconds (positive is fast)
>>> Mar 16 07:04:27 pvweatherbox weewx[7369] INFO weewx.engine: Using
>>> binding 'wx_binding' to database 'weewx.sdb'
>>> Mar 16 07:04:27 pvweatherbox weewx[7369] INFO weewx.manager: Starting
>>> backfill of daily summaries
>>> Mar 16 07:04:27 pvweatherbox weewx[7369] DEBUG weewx.drivers.vantage:
>>> Getting archive packets since 2021-03-14 03:00:00 PDT (1615716000)
>>> Mar 16 07:04:27 pvweatherbox weewx[7369] DEBUG weewx.drivers.vantage:
>>> Gentle wake up of console successful
>>> Mar 16 07:04:29 pvweatherbox weewx[7369] DEBUG weewx.drivers.vantage:
>>> Retrieving 513 page(s); starting index= 1
>>> Mar 16 07:04:29 pvweatherbox weewx[7369] DEBUG weewx.drivers.vantage:
>>> DMPAFT complete: page timestamp 2021-02-26 11:30:00 PST (1614367800) less
>>> than final timestamp 2021-03-14 03:00:00 PDT (1615716000)
>>> Mar 16 07:04:29 pvweatherbox weewx[7369] DEBUG weewx.drivers.vantage:
>>> Catch up complete.
>>> Mar 16 07:04:29 pvweatherbox weewx[7369] INFO weewx.engine: Starting
>>> main packet loop.
>>> Mar 16 07:04:29 pvweatherbox weewx[7369] DEBUG weewx.drivers.vantage:
>>> Gentle wake up of console successful
>>> Mar 16 07:04:29 pvweatherbox weewx[7369] DEBUG weewx.drivers.vantage:
>>> Requesting 200 LOOP packets.
>>> Mar 16 07:04:29 pvweatherbox weewx[7369] DEBUG weewx.drivers.vantage:
>>> Gentle wake up of console successful
>>>
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