as Banjo said could be a cable, fairly easy to repair yourself. but also try that reset by holding both physical buttons until the logo comes up. it wont delete any of your stuff, only the factory reset through itunes will do that. if anything strange goes on with your iphone try this reset first. fixes most problems.
Tangus
1925 - Trojan Utility
1973 - jaguar XJ6
1980 - Series 3 FFR
1980 - Series 3 GS
1998 - 300tdi 130
Any sufficiently advanced technology is indistinguishable from magic. - Clarke's Third Law
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