QLED 85in 8k

[Pgutierrez]

Every time I disconnect my TV it has a hard time reconnecting to my cable box.

all other apps work fine, but after getting the Picture in Picture, when it tries to display full, it disconnects and black screen with a red triangle appears and everything stops working.

Please help, annoying for a high end electronic device 

[GaryB82]

A red triangle with an exclamation mark displayed on your Samsung TV screen typically signifies a One Connect box connection error. This indicates that the TV is not adequately communicating with the external box responsible for managing connections. I recommend contacting support, as the One Connect box may be experiencing malfunction and may require replacement.

1-800-Samsung

https://www.samsung.com/us/support/contact/

[Pgutierrez]

Thank you, I have trying to get support to come and check, unsuccessfully, it has been a problem since I bought the TV. 
Now it is no longer under warranty, I have an official opinion to lean on.

Will follow up with technical support and report here

[GaryB82]

You can also try contacting one of the Service Centers directly also 

https://www.samsung.com/us/support/service/locations/