Yes, sorry, I do use non-default plugins and should have mentioned them. I will use a process of elimination to try determining if one or more of the non-default plugins is the cause.
Here are the non-default plugins I use. Vasilich, if you use any of these, please let us know, since that could be important information.
DnsCachePlugin.dll - 66F8F54C742E250DAC294D36D6C50F21E379AA0D79C79134C35C48D3157D586A
FirewallMonitorPlugin.dll - 59862484C282F0F884AC2E6F61C8C07B0123C8596F0337990F594925708B8A83
ServiceBackupRestorePlugin.dll - 2C67F1ADD89F378F10C76D9ADDCC4CCFB20AA4ED3B3D48A88EDBD21A4F7F93E4
TrustedInstallerPlugin.dll - CCAFBA03059B532BD4CE00B8EC331E502A46E4CFA5499D15560526BE2E4F9D63
It's too hard to find where I got each of these, the files have no embedded version information, and the modification date/times have all been changed on my system, so I listed the SHA-256 hash for each.