This is my uptime
9:28 up 4 days, 10:43, 2 users, load averages: 2.24 1.98 2.04
Console app logged this:
error 09:33:47.041879+0100 NotificationCenter Failed to find type for bluetooth device '668'
error 09:33:35.312823+0100 Console Took tunnel usage assertion to search for bluetooth watches.
error 09:33:55.299401+0100 bluetoothd Error getting Application State for <private>: <private>, 3
And I found this: Resolve Wi-Fi and Bluetooth issues caused by wireless interference - Apple Support
I'm connected via Ethernet adapter, turned WiFi off. My mouse and keyboard are right next to the MacBook, so I can't see where this interference should come from.