I have a Samsung galaxy presendent with straight talk and I will be on the internet and go to click on a page and it would load and it tells me there is no internet connection. Or I'll go to send a message and it won't send. When I pull down the notification bar the mobile data icon will have been turned off. most of the time I can just turn it back on but if I don't notice it right away, it will disconnect my service as well. Then I have to call straightalk then and have them reconnect my service. What can be done to prevent the mobile data from being turned off all together?