CertFindCertificateInStore failed with: (-2146885628) Cannot find object or property.

@AllanD

I got an answer back on this, which is roughly along the lines of "it's a Microsoft thing, and it's not significant for Dropbox (Para. 4 their response below)".

This is the response, and I quote from their email; quote begins:-

"I hope my email finds you well!

The file dbxsvc.exe is a component that we use as part of the Dropbox Sync Experience.

Should you not be a team user, or not sync online-only files, then this file will never start operating. It is, however, created at install for all users regardless of whether you are opted in.

Please note that the issue you are experiencing is technically the volume of times it is writing to the error log, rather than any issue indicated by the process's presence in that error log. In short, due to the way Microsoft categorizes something as report-worthy, we would expect the process to be mentioned in that log 3 times every 24 hours.

At this point, we want to reassure you that everything is working properly and that doesn't indicate a fault.

With that in mind, we understand that you may not wish to see this behavior and apologize if these entries were concerning to you.

We would not recommend attempting to disable dbxsvc.exe. Please note that updating the desktop application or re-installing it will also attempt to re-add this process.

The dbxsvc.exe service will be installed and running as long as the Dropbox desktop application is installed. It is used to either install or uninstall dbx.sys when a user chooses to opt into or out of Sync features.

Finally, If the dbxsvc.exe is not running or does not exist, the Dropbox desktop application will not be able to install dbx.sys, the minifilter to enable Sync features. The Dropbox desktop application doesn't have administrator rights to install or load the driver, these actions are preformed by the dbxsvc.exe service.

I hope this helps. Don’t hesitate to reach out if there is something else you need." :end quote

I suspect that you are a bit like me, in that we both check the Event Viewer regularly, and don't like unexplained Errors piling up in it, especially when they relate to a known process and can be pinned to timings of said process. 

I guess we should be reassured by this response, but I can't say that I'm entirely happy to have dbxsvc continue to deliver this volume of errors, albeit down to a Microsoft foible.