idlk lock files cause SharePoint to stop syncing
I am experiencing exactly this issue (see link below).
I don't understand how you have ignored so many user requests and done nothing about this issue in nearly 7 years!
Pistle Jumbo commented
Theoretically, it could be possible to create an ID stert-up for File > Open that runs an OS delete file <some-part-of-the-filename.idlk> command when the file has fully opened on Sharepoint. No idea of the consequences, though. Perhaps there's a Sharepoint method of disabling its file-locking for ID files, which is a good reason to check with Sharepoint forums or tech support.