I am using a SIM900A gsm module and trying to interface it with a arduino uno. The interfacing was working just fine with both sending and receiving text messages. but suddenly the module is behaving unusually and is not getting connected to the network with any sim card. it keeps blinking every 1s. and after some time the STATUS led turns off for a while and the POWER LED and NETWORK LED glows without blinking for a second or two until the status led starts to glow again. this process keeps on repeating but connectivity to the network is not established. Can anyone help me please with this problem.