can anone help me with following situation:

I have AEM 1313 and sometimes engine shuts down after I hear a click of relay under sterreing wheel and fuel pump stops working and crank sensor doesnt send the signal.

but if you turn the key to OFF position and than start it again the engine starts without problems

yesterday in the morning it did`nt start at all the pump was not working (I didnt hear and Fuel sensor was at 0 position) and when I connected laptop to AEM the crank sensor showed 0 but the starter was working and it should show 150-200RPM.

I took off the battery and charged it - today started without problems (but the battery was ok before I just didnt want to leave it empty on a car)

help!