Network drives showing offline

Hopefully someone can help me out with this one. I have a customer who has a problem i can not seem to solve. 2 or 3 times a day his network drives will show offline (red X on them) but am still able to open them and browse the network happily. The user runs some software which requires the drives to be online and keeps crashing out of it when this happens. There are 8-10 other people on site but not a single one has this issue.
  We thought it might be the machine he was using (surface Pro 3) so we swapped this for a PC but the issue is happening on the PC also. The only difference with this user is that he uses Windows 8 Pro. All other machines are on Windows 7 Pro. So far we have tried a different machine, different network cables, outlets switch ports and created a new Windows profile but the issue still persists. Has anyone got any suggestions i could try?
Thanks in advance.
Samantha SmithAsked:
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David Johnson, CD, MVPOwnerCommented:
check your network power options so they don't sleep or hybrid sleep in the network adapter and power settings.
WORKS2011Managed IT, Cyber Security, BackupCommented:
Open command prompt
Type NET USE <drive letter>: \\servername\sharename /persistent:yes
If you’re asked for credentials enter.
Samantha SmithAuthor Commented:
I have checked the power settings and all looks fine. The issue is very intermittent and can happen around 2/3 times a day while using the machine. The first we know of it is when a certain please of software will crash as it thinks the drive is offline. A restart of the machine will get the drives showing as online again.
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Lionel MMSmall Business IT ConsultantCommented:
this may help you--this is the idle timeout settings

Idle Connection Timer
This is the amount of time that a connection can be idle before being disconnected. An idle connection is defined as a connection which has no existing open handles (no open files, directories, search contexts, etc.), and no pending operation. The Idle Connection Timer is implementation-specific.
When the server receives a message, Server.Connection.IdleTime is set to the current time plus Server.AutoDisconnectTimeout [MS-CIFS].
On Windows servers it can be configured through the Autodisconnect registry key [KB297684].
Value type: Dword
Value name: Autodisconnect
Default:    15 (minutes)
The Autodisconnect can also be configured through group policy:
Computer Configuration\Windows Settings\Security Settings\Local Policies\Security Options
"Microsoft network server: Amount of idle time required before suspending session"

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Samantha SmithAuthor Commented:
lionelmm - When i open the drives once they show disconnected, they still show disconnected but open fine. The only way to get rid of the Red X is to restart the machine.
Lionel MMSmall Business IT ConsultantCommented:
did you try changing the timeout settings and are you hitting F5 to refesh Windows Explore view to get rid of the X once you used it?
Samantha SmithAuthor Commented:
Hi Lionelmm, i have changed the timeout setting today so i guess i will monitor this to see if it stops the issue.
Michael LakeFounderCommented:
Are you connected to a domain or workgroup?  You may be running into workgroup limited number of connections type issue.
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