[DashDevil]

 is this an occasional thing, or an every time thing? I just did a clean install of 9.0 on my Haswell Dell box (w/latest UEFI firmware), and did 5 or so suspend/resume sequences without any issue.  What I would do is wait until you're able to manually reconnect, then ssh in and look at the kernel log (dmesg) and see what's going on when resuming from suspend -- there's likely something about the wifi connection there that will provide more info

Thanks for the reply. It was an every time thing. After looking into the logs I found out that it seems to be the 5ghz connection which is not working properly. Finally I saw that I never configured libreelec to only connect to my 2,4ghz network... After removing the 5ghz connection and only having the 2,4ghz connection saved, everything works fine now. Does the Asus Chromebox wifi adapter maybe have limitations regarding some 5ghz channels or something like that? I would have preferred to use 5ghz but 2,4ghz seems to be sufficent for HD streaming.