BAD PRODUCT

I purchased a LG tv from Makro. Ever since I purchased the TV I had a problem with connecting it to the internet. I tried a direct cable from my router to my TV and also tried to connect it on the WiFi. The TV connects for 10 minutes then it disconnects. I connected a TV box to the TV and the TV box connects to the wifi perfectly fine. Your technician came out to my house yesterday to investigate and he told me, there is nothing wrong with the TV , it is my wifi. Please explain to me why the tv box connects perfectly fine from the exact same location. The TV is definitely the problem. Can I have a solution?