Review on Optimus H 7004 Portable Ceramic Thermostat by Mohamed Greene

I bought one on August 10th. He only worked occasionally, mostly not. Replacement on 22.08. The new one had issues but both worked fine until the first one stopped working on September 3rd so I boxed it up for a return. The next day, the replacement stopped working all morning and then started working again. Ordered a replacement from Revain, a DIFFERENT BRAND. I use it as my primary heater, so I need RELIABILITY, and I can't figure out why these heaters stay on for a few hours or days, then start running for a week or two, and then shut off again. If it works, it's great. I'll keep the second one until it stops working again, then order another backup and maybe a different brand. When they leave, nothing works except the thermostat light, which turns on and off at room temperature. Fan and heater never come on.