8 inch tablet released in July of 2019. Came as a 32GB or 64GB model. The display is a TFT LCD with a resolution of 800 x 1280 pixels. Main Camera is a 8 MP camera and the selfie cam is a 2MP cam. The versions are: SM-T290 (Wi-Fi); SM-T295 (LTE)
The wi-fi on my tablet doesn't work properly, there are certain places in my home where the wi-fi doesn't work, and places that do, and that's just on my device my family's devices work properly.
Try using the tablet's WiFi as close as possible to the network router in your premises i.e. <10cm and check if it works OK and that it maintains a stable connection.
If it works OK it may be a loose WiFi antenna connection that is the problem, (supplier example only to show what the antenna looks like)
Here's a teardown video for the tablet that may help.
The antenna can be seen being removed from the tablet at ~1:51 minutes into the video.