A folder on the server is intermittently unavailable to one of the users.

My customer's boss couldn't see a shared folder on the server. This has been recurring for some time. The boss has Windows 7, the server is on Windows Server 2012 R2.
When our techs use, eg, Logmein, to see the problem, it fixes itself. Until a day or 3 later, when the problem reappears.
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What type of share is it?  Sounds as though it might be a stale session issue. i.e. the server has a record, but the user does not. on a request, the user gets an error because the server connection back is not present.
Does this happen after the individual's system goes to sleep/hibernate?
i..e a reboot fixes it, one option is to deal with power settings, not allowing the system to hibernate/sleep when it is on AC power.

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unrealone1Author Commented:
After we mentioned stale sessions to the customer we learnt that he simply puts the pc to sleep , so thank you, this was really useful advice.
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