Connection Works Then Stops After Sleep

When a machine sleeps, it powers down parts of itself to save energy, and the network adapter is often among them. On waking it must spring back, rejoin the router, and renew the address it was lent before sleeping. If the driver mishandles that resume, or the adapter's firmware comes back only partway, the connection can appear present while moving no traffic at all. An address that was not renewed leaves the device technically joined yet unable to communicate. Because this only happens across the sleep boundary, steady use never reveals it, and the timing points straight at the cause.

• Networking is fine until the device sleeps, then stops on waking
• The connection only returns after a restart
• The adapter shows as connected but moves no traffic after waking
• The fault never appears during continuous use

• 1Power-saving settings cutting power to the adapter during sleep
• 2The adapter failing to re-establish its session on resume
• 3An address assignment that is not renewed after waking
• 4A driver that mishandles the transition out of sleep
• 5Firmware on the adapter that resumes incompletely

• Observe whether the fault appears only after sleep and never during steady use
• Note if disabling power saving for the adapter keeps it alive through sleep
• Watch whether the connection returns on its own after a short wait or needs a restart
• Check whether a wired link survives sleep while wireless does not, narrowing the cause

1. 1

   Confirm the pattern after sleep

   Verify the connection only fails once the machine wakes and never during steady use, which points straight at how power management handles the adapter.

2. 2

   Adjust the adapter's power settings

   Change the power options so the adapter is not starved of power during sleep, letting it resume its session cleanly on waking.

3. 3

   Update the adapter driver

   Bring the adapter driver up to date so it handles the transition out of sleep the way it was designed to.

4. 4

   Allow a moment to reconnect

   After waking, give the machine a short pause so the address has time to renew before you expect traffic to flow.

5. 5

   Confirm the link survives sleep

   Let the device sleep and wake, then check that the connection returns on its own and moves traffic without needing a restart.

Adjust the adapter's power settings so it is not starved of power during sleep, which lets it resume its session cleanly on waking. Keeping its driver current helps it handle the transition out of sleep the way it was designed to. Where the trouble persists, letting the machine settle for a short moment after waking gives the address time to renew before you expect traffic. For tasks that must never be interrupted, a wired link, which tends to survive sleep more reliably, offers a steadier path while the wireless side is sorted out.