Issues timesyncing the KG100S with an Amazon Capable endpoint via CSS

Hi, We are running into issues achieving time-sync via CSS from our custom hardware (using the KG100S module) to an amazon CSS capable endpoint. Our code is running on top of the stock Pro Kit + KG100S and our custom board. Essentially what we have done is integrate a stock BLE central sw example from SI Labs with the Hello world Sidewalk sw example to simultaneously run a BLE central on the KG100S with the CSS sidewalk implementation. We are using GDSK 4.3.0 and Sidewalk extension 1.1.0. We run into an issue where sometimes we cannot time sync. This is a setup which has a CSS capable endpoint within BLE range of the custom hardware running the above software package. Is this something people run into, not getting timesync sometimes? If so, what can we do to address this? If not, what can we look at for solving? We have this issue as well on the original development kit from Si Labs running on top of the KG100S module, as well as when using the off-the-shelf sw example for sidewalk comms to the demo AWS IoT endpoint. Open to all insights. Thank you!

hello, sorry for late reply, could tell us your current firmware version? thanks