I have a problem with an SIM800L module. I tried to connect the SIM800L to the network, but it does not connect. The LED should flash 3 times per second, but it slowly flashes 9 times, then turns off, then 7 times, then turns off again, and the cycle repeats.
The power source that I use is 4 VDC, 2A. I connected a capacitor to the power pins.
GND and NET are short-circuited, is this normal? I tried to unsolder an external antenna connector and cut the wire, but it did not help.
I got a new module, but the problem remains. Could the party be defective?