XPS 13 7390 wifi & network issues

Every time I leave my laptop to sleep for 5 hours or so, the all available networks disappear from the networks tab like I'm on airplane mode. This has happened before with my previous XPS 13's which I decided to exchange. The networks only seem to pop up again after I run a diagnostic test on the UEFI which takes way too long to do every time. Other than that, the wifi works completely fine. I've downloaded and redownloaded all needed and necessary drivers. I don't know what's wrong.