LoRa Ai thinker ra-02 short circuit

Hello.

I've been using lora (sx1276 and sx1278) for a while, on various different modules.

But recently i have bought a few Ai thinker RA-02 modules and half of these turned out to be short circuited on vcc (3.3v)-GND.

Happened to anyone else?

Any idea why?

Thanks.