Screen turns itself off while audio continues to play

I bought this TV 4 years ago from Sam’s Club. It is a 48” LED 1080P, 60Hz HDTV, model #613380. It has served me well - until this week.

While watching this TV, the screen suddenly goes black but the audio continues.

I can turn the TV off for awhile, then turn it back on and the picture appears. A few minutes later the screen goes black again.

I use two HDMI ports for input - one for DishNetwork TV and one for blu-ray player. This problem occurs in both ports, so it must be a problem that is more central to the TV overall.

I’m wondering if it can be repaired for a reasonable price, or should I just throw it away and replace it. (If I have to replace it, it won’t be another Sanyo!)

Also, I visited the Sanyo website, found the link to “support,” and was taken to a totally blank page. Absolutely NO content. Apparently Sanyo doesn’t want to know about its problems or its unhappy customers.