Angry [Q] Wifi Rinning on issue Toshiba AT300

Hi guys.

I have really annoing issue with my tablet. Few days ago my tablet run off battery, so
I plug it into charger and run on, next then I saw that WiFi is running on, but it is constantly running on and it never runs.
I do wipe and clean everything but it dont working, after few hours it start working again. I was thinking that was just weird bug and it never come again but its come today.

I dont know why its happend, it is not 'cause of low battery because my battery is full now. I have around 500mb free RAM so this is not problem too.

Additionaly when screen goes black and i wake up my tablet it slow down incredibly and it need 2 mins to go to homescreen (and it is fast again after that.).

I have PC Tablet Toshiba AT300, never rooted, witch stock rom and nevest update (android 4.1.1) and also I have poor english.

If you have any solution then help me, please.

If this post is in wrong place then moove it if you can.