those are pretty common qc and qa issues associated with china brand tv. both hisense and tcl have those issues with constantly breaking down tv. on some models, the corner cost cutting is so bad, they used too slow cpu for the smart tv functions, internet apps, google/android tv apps so all the smartv tv app functions are too slow and laggy to be usable. just take it as a dumb tv and dont bother with the smart app functions. its so cheap anyway, what u expect?!
could also be because of US sanctions on china in the microchip tech sector, that the china companies cant put powderful cpu into their smart tvs, thats why so slow and laggy lor... but this is not edmw so i'll leave it at that. no further comment. apologies for dragging geopolitics into the technical forum thread.
so if u not tech savvy or have a busy hectic lifestyle and u just dont have the time to take tlc of the china brand tvs, then just stick to the korean and japanese branded tvs like the other members said and pay and pay more for it lor!