Chosen Solution
What can I do if I am unable to connect via WiFi after completing an Acer Android tablet system ?
check the options, maybe the system is rebooting
This issue happens with me a lot. I just follow these steps to connect via wifi. (Apps–> settings –> wireless and networks –> wifi ) then turn it off. Restart the tablet and then do the same thing (Apps–> settings –> wireless and networks –> wifi )and re-enable wifi.