O365 Onedrive for business mapped drive issue

Dear Experts,

I have a small group of users with O365 accounts. All have access to a onedrive share to which I have mapped a drive letter.  This has worked well for over a year now.  A few days ago, one user approached me complaining that the mapped drive was disconnected. So I logged on to the portal, browsed to the share and opened it in explorer, then I could re-map the drive.  However, as soon as the computer restarts, the drive disconnects again.

So far, I have:
- checked website address exists in the trusted zones
- checked the webclient service is running
- cleared out all temp files, saved passwords, cookies and temporary internet files
- removed all entries in the windows credential manager
- changed the O365 password
- logged in checking "keep me signed in"

I have also tried mapping the drive from a command prompt.

I read somewhere that a token may have expired.  Can this be renewed?

Any suggestions

Many thanks
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tech53Asked:
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Vasil Michev (MVP)Commented:
The token needs to be periodically renewed, i.e. the user needs to login to SPO every now and then. When you login to the portal (SPO) and select the "keep me signed in" box, the token lifetime is extended to the maximum possible value, but it will still expire. This has always been the case, not sure if Microsoft havent decreased the lifetime of the token further.

Here's a reference article: https://support.microsoft.com/en-us/kb/2616712

Note After you map a network drive to SharePoint Online, you must occasionally connect to the SharePoint Online site through Internet Explorer and select the option to Keep me signed-in. This prevents the session used by the mapped network drive from expiring. A mapped network drive that’s connected to SharePoint Online is only supported when these steps are performed within Internet Explorer.

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