I bought the phone March last year and it was the best phone I ever had (since I don't usually spend allot on them). Over the course of course there were bumps and wears throughout but nothing serious. Just months ago I started to notice it restarts a few number of times while the mobile hotspot was on. I initially just thought that it was just due to the temp of the phone plus the weather. Then one time it did the restart again and once it booted I can't turn on the WIFI anymore even with multiple restarts. So now I only use mobile data.
As being a developer and former android developer for sometime I did try to research and there were a couple of similar issues to this and also tried to check for system updates regularly. There were ones doing a downgrade to A12 (which mine is A13 atm and at the time the issue came up). I didn't come far to flashing the MOD nor downgrading. Because there were (probably 2 instances) when I just randomly restarted it and then "magically" the WIFI comes back to life. Then once it came back I instantly checked for a system update and it did have a minor update but when it restarted "poof" WIFI's dead again.
I encountered this "magic" WIFI coming back to life once more while just randomly restarting then one time while outside (I was using mobile data and hotspot) it did the force restart again and then the WIFI doesn't turn on up to this point.
It's really frustrating and disappointing that what I thought would be a solid phone that would last maybe just a couple more months or another year perhaps would just turn into a uncapable phone that only has mobile data internet.
I ran out of luck restarting it hoping it comes back again and also trying out the tips from XDA (still except from flashing and downgrading - which I find to be tedious and frustrating work if it still doesn't work).
Here's the logcat logs I got when turning on/off the WIFI switch (which doesn't do a thing anymore).
09-05 20:28:36.912 1421 2345 E HalDevMgr: Cannot start IWifi: 9 ()
09-05 20:28:36.912 1421 2345 E WifiVendorHal: Failed to start vendor HAL
09-05 20:28:36.912 1421 2345 E WifiNative: Failed to start vendor HAL
09-05 20:28:36.913 1421 2345 E WifiNative: Failed to start Hal
09-05 20:28:36.913 1421 2345 E WifiClientModeManager[unknown]: Failed to create ClientInterface. Sit in Idle
09-05 20:28:36.913 1421 2345 E WifiActiveModeWarden: ClientModeManager start failed!ConcreteClientModeManager{id=1112115 iface=null role=null}
09-05 20:28:36.916 1421 2345 E WifiActiveModeWarden: One of the native daemons died. Triggering recovery
09-05 20:28:36.916 1421 2345 E WifiSelfRecovery: Triggering recovery for reason: WifiNative Failure
09-05 20:28:36.916 1421 2345 E WifiSelfRecovery: Already restarted wifi 2 times in last 1 hour. Disabling wifi
09-05 20:28:36.916 1421 2345 E HalDevMgr: IWifiEventCallback.onFailure: 9 ()
09-05 20:28:36.919 1421 2345 E WifiActiveModeWarden: One of the native daemons died. Triggering recovery
09-05 20:28:36.920 1421 2345 E WifiSelfRecovery: Triggering recovery for reason: WifiNative Failure
