Extender constantly not connecting to main wifi unless I restart it

For some time now, my wifi extender has been regularly (Longest time I've gone between having a problem has been maybe three or so days) refusing to connect to the main wifi, and will only do so if I reset the device and go through setup again, or if I powercycle it. The wifi for it will show full bars in my taskbar, but if I connect to it, it gives me a yellow error tag, and says "no internet, secured"

I've checked to make sure that there's no firmware I need to download for it, and it is placed where it should be able to get a strong connection to wifi. 

I only got this extender in 2015, so I really shouldn't be having to buy another one to replace this one, but it constantly dropping connection is just driving me nuts.