Same issue here with the same error in the Application Event log.
Appears to have started after a Plex Media Server update that also updated Visual C++ 2015-2019 Redistributable (x86) on 03/25/22. No other updates or changes were made to the server at the time and the errors began within hours of the installed updates. Some quick googling shows that ucrtbase.dll is part of Visual C++.
OS: Windows Server 2012 R2
Visual C++ 2015-2019 Redistributable (x86) 14.24.28127.4
Plex Media Server 1.25.8.5663
EDIT: Other threads reporting the same issue on various OS’s. Plex team responded that the devs are looking into it.
