Switched from Nokia 520 to galaxy s4..HATE IT !! Galaxy won't stay on with fi wi without turning mobile data off all the time! Used 1gb in 2 days !!! While at home on wi fi ..or so I thought ..won't pair with car 2014 cruze to read texts!? Had no issues with my windows phone !?!?! Why ??????
I'm sorry to hear about your issues with your GS4, I've been running mine since launch and have been quite happy with it.
Edit: Before moving on to my suggestions, give Ahmad's suggestion of taking out the battery first.
Did you update it to the latest version? If not, try to do the update and see if that helps you out a bit. If you are up to date, consider doing a factory reset. Whenever I did have any issues with it, a quick factory reset resolved all of them. If you do a factory reset and are still experiencing issues, let us know or contact Koodo directly. If you are within your first 14 days with the phone, you can always exchange it if you believe you have a defect.
Unfortunately I have had the phone 4 weeks now ,I called customer service for help and was told I had to turn mobile data off all the time to ensure wi fi connection.!?! ..the phone will read incoming calls but not texts ...like my windows phone, no solution or advise given. I will try your suggestions.
THANK YOU ! for you response !