DA14580 stops after advertising

Hello,

We are using a ENW-89846A1KF in our design, and it works. But now we want to switch to Sesub-pan-d14580
because of the size.

We supply it with 3.3V, max 8mA. We use UART + Flow Control with 115200 baud and we can communicate
with the IC with out external processor and we get the module to advertise, and we see it for a short period of time
on our test software (with a BT dongle), and then we exchange some packets betweenmodule<>BT Dongle,
and then the communication stops. And the BT_RTS line is pulled high all the time directly after advertising.

Also, after the BT module starts
advertising, even with a connect request from out BT dongle, no data is sent to the processor or vice versa.

So, UART communication is good, Antenna looks good, Power is OK, but maybe we missed some important settings while
migrating from one module to another.

Is there anything we need to change in software which we sent to DA14580 via UART, or are there things we need
to change?

Thanks!