mike1412 wrote:
Ventura 13.4 update causes sleep mode disconnects of LG Thunderbolt external monitors and the only way to fix it is to disconnect the monitor and reconnect it
You can try a SafeBoot How to use safe mode on your Mac - Apple Support to sort anomalies.
does a quick disk repair before it fully boots up, and certain system caches get cleared and rebuilt, including dynamic loader cache, font cache, etc., third party system modifications and system accelerations are disabled.
Login and test. Reboot as normal and test. Caches get rebuilt automatically.
no resolve—
Call Customer Support (800) MY–APPLE (800–692–7753)
or on line https://getsupport.apple.com/
Outside the USA—Contact Apple for support and service by phone
See a list of Apple phone numbers around the world.
Contact Apple for support and service - Apple Support