I don't thing there is anything you can do. This was a problem in the past also that I have seen or even that the WGB itself would need to be rebooted. Maybe have a machine do a constant ping the WGB overnight and see if the WGB stays up.
Transferring Crash file from standby: Login to the Active WLC in HA.
From CLI: (Cisco Controller) >transfer upload datatype crash (Cisco
Controller) >transfer upload filename (Cisco
Controller) >transfer upload mode tftp (Cisco Controller) >transfer
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