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Been using the fill cache to 2 days with other desired project, then set cache to 2,5 days and only HTSB, getting all I can stand and only have to switch to other projects about once a week. gone from 60 days completed to over 180 since restart

Not an direct answer to your problem as to why something has changed - but a workaround that may help in the meantime until resolved... (or you might want to consider this as a permanent possibility anyway).

Run a little program here called "automachron" (search for achron5.exe ) on all windows machines that syncs with an NTP server every five minutes to maintain the windows clock constantly within a handful of milliseconds.

Run NTP servers on Linux here and sync to one of these, but automachron works just as well syncing to one of the many open NTP servers available on the Internet. Just pick one that is close ip wise to minimise transmission delays

For setting time very accurately and running as a Windows service, I recommend the Windows port of ntpd at https://www.meinbergglobal.com/english/sw/ntp.htm.

0.2 second is good enough for most purposes! Also note that ntpd needs an hour or two to reach a steady state, longer with a less stable internet connection. It also depends on the NTP servers you are configured to use, local ones being preferable; ones provided by your ISP are generally the best choice, and those from the NTP Pool Project are a good second choice.