I am using tewee 2 since 2 years and I do not find any big issues apart from little slowness. I feel like slowness is because of compatibility between WIFI and TEWEE 2. Try to go through the link and ready tand use the tewee 2.
https://tewee.in/wifisettings.html
Built quality of the product is so slim and strong compared with previous tewee device. I suggest to go for it and enjoy the smart features in non smart TV ??