Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Doesnt work right and customer support is non-existant

I bought this unit to replace a 2.4Ghz setup that interefered with a new 2.4 Ghz phone I bought. I got it hooked up and it looked like it was working and then noticed a horizontal hold problem where the picture would randomly flip top to bottom, especially with a mostly white image. Other than that, picture and sound were great. I used the tech support link on the manufacturers website to ask about this problem. No reply for a week. Send it again, still no reply. Emailed them, no reply. Wondering if this company still exists.