I have a Seagate expansion drive attached to my router as USB storage. This worked fine up until recently but recently the router stopped recognising the drive entirely.

I have formatted the drive and reconnected, but now when I map it as a network drive I cannot open folders on it. Testing with other USB devices gives intermittent results, and the drive works fine elsewhere so I suspect the issue is the router itself.

Does anybody have any ideas on how to resolve this?