I have a 60" a quo's smart 4K tv. It shuts off with Vaduz and Hulu. Not with spectrum cable how can I fix this

SOURCE: Channels change by themselves after 20-30 minutes of tv being on

Have you tried covering the IR eye on the front of the TV when this starts occuring? Sometimes other devices in your home can emit infrared light that in rare cases can be picked up by your TV as a command from the remote. If covering the eye seems to stop the problem, I would say my guess is correct. If the problem continues even with the IR eye blocked I would say that the internal tuner of the TV might be defective. good luck!

SOURCE: Philips/Magnavox TV, model MS3250C321 shuts off randomly.

TV shutting off automatically means its a problem with the Lamp. Contact Pioneer or any local tech shop or Best buy and get the same replaced.
Turning off after specific time : Go to the timer option and disable the Automatically Switch off option. This will resolve the issue. Please let me know if it worked. If you need the user manual or instruction manula please click on the link below
http://www.generalmanual.com/Televisions/Sanyo-DP19647-Wide-Screen-Integrated-Digital-LCD-HDTV.htm. Hope this will be of help to you.

Thanks

SOURCE: TV shuts itself off after a couple minutes of being on.

One must be very careful of the quality of the replacement lamp. Many of the cheap 'deals' on the web for replacement lamps are substandard. I always recommend that replacement bulbs be the original manufacturers bulb.

SOURCE: my westinghouse tv works for like 10 minutes then shuts off

The first thing I would recommend for this problem is to do a factory reset. The way to do this is to go in to the menu, go under the settings tab, and select factory reset (in some models it will only say reset). If this does not fix the problem than you will need to replace your power board, you can find the parts you are looking for by emailing Westinghouse part department at [email protected], they will let you know price and availability on the power board. If this solves you problem please rate my help on this website.

SOURCE: My Westinghouse TV shuts off

This sounds like a power board failure. Try calling your manufacturer and ask them if the TV is still under warranty. If it is have them dispatch a technician to repair the problem. If not, you are better off replacing the TV as the repair cost would exceed it's worth.