my dhd keeps coming up saying unable to detect sim card , then it says restart or shut down and properly insert card , i dont touch the sim card at all and it works ok for days then says it again . my friend had hers do the same and had to get it sent off (after trying new sim etc...) but it was happening more on hers than mine does, luckily hers was still in warranty mine isnt so is there any way i can sort this without having to send off , thanx