I know you will have done this but have you powered down your C8since the update? I think I read somewhere that sometimes after an update it can be good to power down if things aren't working the way they should. Might be worth a try if you haven't.
It’s on the bottom left hand side and easily accessible
Mine is wall mounted, updated from USB no issues this morning. Airplay isn’t working well though. Videos filmed in 4K on my iPhone are very juddery and constantly buffer. 4K videos filmed on my DJI drone and transferred to my iPhone play ok-ish, with a little judder.
C8 is hardwired to my router. Bit of an anticlimax in all honesty.