Update = User unistalled the SmartByte app which fixed the issues. Open the article below and go to section 3. Troubleshooting Network Performance Issues on Inspiron Systems
For the past month or so image backups of my laptop have failed with the WiFi adapter going disabled.  Sometimes Windows Troubleshoot process will re-enable the adapter, but usually a reboot is required.  The same failing backups succeed when an external WiFi dongle is used.  It's just the internal adapter that fails this way.  And BTW, no Windows Event records are logged when the adapter disables.  It's a silent failure. In spite of the Inspiron 3793 documentation claiming the laptop contains an Intel WiFi adapter, Windows says it's a Qualcomm QCA9377.  I've tried upgrading the driver but that did not solve the problem.  The problem may have started when I unintentionally upgraded the BIOS.  (Once the process had started I was reluctant to stop it so I let it continue.)  I'm now at level 1.18.0.  I'd go back to my previous level, but I don't know what it was.  I also don't know if that requires backing out to an earlier version of the Intel management Engine. Does this sound like a familiar problem?  And is there any easy solution?
Inspiron 17 - 3793 - Large WiFi writes disable WiFi adapter