MY PICTURE SETTINGS KEEPS RESETTING ITSELF AFTER ABOUT 40 MINS.

https://www.pcmag.com/how-to/stop-tv-from-turning-on-off

Is the picture ok when it's on?

Electronics have gone south. Sorry.

Hello, if the "Dish logo" flashes then no picture, it sounds like a Dish receiver problem not a tv set issue. Try hooking up a dvd player to it and see if it works. If it does, try resetting your Dish receiver. Thanks....Terry

Resetting a CPU after a battery change is done with a code reader /scanner

Try activating auto-update time in settings

could be injector pump settings engine getting too much fuel try resetting computer disconnect batt for 5 mins then reconnect might reset itself

check the sleep timer/ child lock

CHEAP TV VIDEO REPAIRS
Can't be 100% sure but the most likely cause of the problem is bad solder connections in the switch mode power supply or on the vertical output IC, or anywhere on the main or picture tube circuit boards, due to age and switching on and off TV's develop bad solder connections when cold the connection is made and when it warms up due to heat expansion the connection breaks, you will need to be handy with a soldering iron, and discharge all power supplies with something like a 100 Watt globe before soldering or you may blow things up and do really serious damage, and be warned TV 's have very high voltages 360 volts DC in the SMPS primary and over 20,000 volts to the picture tube, so be careful.

You have done all the usuall checks, but you may have a usb power problem, try the printer without any other usb peripheral in and see if it stays connected. If not, then the usb connection or workings in the printer may be faulty and keeps disconecting, hence the bing bong as it re connects to windows. You may have faulty hardware, leave the printer disconnected from usb and mains for 15 mins or so then try again.