iphone 4 randomly shows no service straight talk

iPhone 4, randomly shows no service (straight talk)
location: apple.com - date: January 14, 2013
I bought my iPhone 4 a little over a month ago with the inten of using it on the StraightTalk service via sim.  At first everything was working great, got it jailbroken for the 3g/mms to work without too many problems.   However within the first week we started to notice that it would say "no service" or "searching" sometimes.   At first we thought it was just the account going through some stuff since it was new and it would resolve itself.  Now, a month later it's still doing it and I believe it might have even gotten worse.   Usually when I get up in the morning I will have to reset it due to it saying no service, resetting the phone usually will fix it.    Anybody else run into anything like this?   I found out Straight Talk has some of the worst customer service I've ever encountered in my life.   I asked them to send a replacement sim car
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