Use the driver fixes to download a better network card, then replace the 8723DE permanently. Your sanity is worth the $20. Have you successfully tamed the 8723DE, or did you throw your laptop out the window? Let me know in the comments below!
Even on Windows, users report random disconnects, high latency (ping spikes in games), and the card disappearing from Device Manager after sleep mode.
realtek-8723de-wireless-lan-fix