WiFi Android not connecting?

Question

Android

phone on android 4.4.2, stock firmware, connects every other time, it will connect normally, then when connected it says "saved, WPA2-PSK protection", sometimes you reboot the phone connects normally, and sometimes it does not connect even after reboot. Such hnya is regular, it can cling to the network normally for half a year, sometimes it starts to wriggle out, the software, "extra", has not been installed for a long time, everything was delivered immediately after buying the phone, the device is 1.5 years old.
Zyuchel Kinetic Lite router.
Threat tablets, in the amount of 2 pieces, with the same version of Andrew cling without problems.
who can suggest a solution or give options where to dig.

Answer 1

Hardware problems with the Wi-Fi adapter most likely. You can completely update the firmware, if the problem is software, then it should disappear.