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Never use BT for anything I don't have to, super patchy (apart from Android carplay seems solid in just about any car/rental I jump in which is nice). But yeah, Wifi been fine until most recent update, retailer and marantz just sending me the usual universal fixes, likely not even aware yet that the most recent update is causing issues. Now have a giant patch cable stretched across the room, pretty, not.
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You can get stuff like this (I've no idea if this specific one is any good) to convert wifi to ethernet neatly
https://www.amazon.co.uk/Bridge-Convert-Ethernet-Wireless-Repeater/dp/B07TND8849
... Fucking wireless....
Bluetooth is the worst.