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Does Windows 8.1 block access to PCs that are not up to date with Windows Updates?

Last Modified: 2015-09-18
In my office network there is a Windows 7 PC that has a shared folder used by several other PCs.  One of them, a recently purchased Windows 8.1 desktop, looses the ability to see this Windows 7 machine after "a while" - usually about 3 to 4 weeks. Trying to open the share results in "no such host" messages. If we install Windows Updates on the Win7 box and reboot it, then it is visible again to the "problem" desktop. No other Win8x desktop in the office shows this behavior.

Is there a security setting of some sort in Win8.1 that could cause this? (Yes, I know we should update the Win7 box more often, but it's most disconcerting to have this PC lose access to the share without warning if we forget.) Or, is this just superstition and it's really something else?
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