STM8L and STM8S resets abruptly taking a lot of current during sleep

Hi friends,

We are using STM8L(STM8L051F3) and STM8S (STM8S003F3) for a project. I has been designed, developed and deployed. It works as expected - STM8L as a transmitter, wakes up from stand-by mode, collect some data, transmits it and goes back to stand-by mode and STM8S as a receiver, receives it and represents it visually. This set up has been deployed and working for over a year now.

Now we redesigned the board with some extra functionality. We made the board and soldered the...

STM8L and STM8S resets abruptly taking a lot of current during sleep