no screen phone calls/poor wifi

[quadman 64]

whenever I hit call button screen goes black and have to hit power button 2xs to come back on. its a pain when I want speaker phone or need keypad. also have trouble connecting to some wifi. put in and check and recheck password. get message can't connect to wifi

 

[abhishek singh21]

perform a soft reset by holing together volume down+power key until phone reboots.